31. Analytical Chemistry

Given below are two statements:
Statement-I: The gas liberated on warming a salt with dil H2SO4, turns a piece of paper dipped in lead acetate into black, it is a confirmatory test for sulphide ion.
Statement-II: In statement-I the colour of paper turns black because of formation of lead sulphite. In the light of the above statements, choose the most appropriate answer from the options given below:

[30-Jan-2024 Shift 1]

Given below are two statements:
Statement-I: The gas liberated on warming a salt with dil H2SO4, turns a piece of paper dipped in lead acetate into black, it is a confirmatory test for sulphide ion.
Statement-II: In statement-I the colour of paper turns black because of formation of lead sulphite. In the light of the above statements, choose the most appropriate answer from the options given below:

[30-Jan-2024 Shift 1]

Q.6 Correct

Q.6 In-correct

Q.6 Unattempt

Number of metal ions characterized by flame test among the following is_______
Sr2+,Ba2+,Ca2+,Cu2+,Zn2+,Co2+,Fe2+

[30-Jan-2024 Shift 2]

Number of metal ions characterized by flame test among the following is_______
Sr2+,Ba2+,Ca2+,Cu2+,Zn2+,Co2+,Fe2+

[30-Jan-2024 Shift 2]

Q.7 Correct

Q.7 In-correct

Q.7 Unattempt

The compound that is white in color is

[31-Jan-2024 Shift 1]

The compound that is white in color is

[31-Jan-2024 Shift 1]

Q.8 Correct

Q.8 In-correct

Q.8 Unattempt

Molar mass of the salt from NaBr,NaNO3,KI and CaF2 which does not evolve coloured vapours on heating with concentrated H2SO4 is ______gmol−1, (Molar mass in gmol−1:Na:23,N:14,K:39, O:16,Br:80,I:127,F:19,Ca:40

[31-Jan-2024 Shift 1]

Molar mass of the salt from NaBr,NaNO3,KI and CaF2 which does not evolve coloured vapours on heating with concentrated H2SO4 is ______gmol−1, (Molar mass in gmol−1:Na:23,N:14,K:39, O:16,Br:80,I:127,F:19,Ca:40

[31-Jan-2024 Shift 1]

Q.9 Correct

Q.9 In-correct

Q.9 Unattempt

Which of the following cannot function as an oxidising agent?

[27-Jan-2024 Shift 2]

Which of the following cannot function as an oxidising agent?

[27-Jan-2024 Shift 2]

Q.10 Correct

Q.10 In-correct

Q.10 Unattempt

Chlorine undergoes disproportionation in alkaline medium as shown below :
‌ a ‌Cl2(g)+bOH−(aq)→cClO−(aq)+dCl−(aq) +eH2O(l)
The values of a,b,c and d in a balanced redox reaction are respectively :

[29-Jan-2024 Shift 1]

Chlorine undergoes disproportionation in alkaline medium as shown below :
‌ a ‌Cl2(g)+bOH−(aq)→cClO−(aq)+dCl−(aq) +eH2O(l)
The values of a,b,c and d in a balanced redox reaction are respectively :

[29-Jan-2024 Shift 1]

Q.11 Correct

Q.11 In-correct

Q.11 Unattempt

KMnO4 decomposes on heating at 513K to form O2 along with

[29-Jan-2024 Shift 1]

KMnO4 decomposes on heating at 513K to form O2 along with

[29-Jan-2024 Shift 1]

Q.12 Correct

Q.12 In-correct

Q.12 Unattempt

If 50‌mL of 0.5M oxalic acid is required to neutralise 25‌mL of NaOH solution, the amount of NaOH in 50‌mL of given NaOH solution is ____g.

[29-Jan-2024 Shift 2]

If 50‌mL of 0.5M oxalic acid is required to neutralise 25‌mL of NaOH solution, the amount of NaOH in 50‌mL of given NaOH solution is ____g.

[29-Jan-2024 Shift 2]

Q.13 Correct

Q.13 In-correct

Q.13 Unattempt

2MnO4−+bI−+cH2O→xI2+yMnO2+zOH−
If the above equation is balanced with integer coefficients, the value of z is____

[30-Jan-2024 Shift 1]

2MnO4−+bI−+cH2O→xI2+yMnO2+zOH−
If the above equation is balanced with integer coefficients, the value of z is____

[30-Jan-2024 Shift 1]

Q.14 Correct

Q.14 In-correct

Q.14 Unattempt

Total number of species from the following which can undergo disproportionation reaction________
H2O2,ClO3−,P4,Cl2,Ag,Cu+1,F2,NO2,K+

[30-Jan-2024 Shift 2]

Total number of species from the following which can undergo disproportionation reaction________
H2O2,ClO3−,P4,Cl2,Ag,Cu+1,F2,NO2,K+

[30-Jan-2024 Shift 2]

Q.15 Correct

Q.15 In-correct

Q.15 Unattempt

Given below are two statements :
Statement I: S8 solid undergoes disproportionation reaction under alkaline conditions to form S2− and S2O3‌2−
Statement II: ClO4−can undergo disproportionation reaction under acidic condition. In the light of the above statements, choose the most appropriate answer from the options given below :

[31-Jan-2024 Shift 2]

Given below are two statements :
Statement I: S8 solid undergoes disproportionation reaction under alkaline conditions to form S2− and S2O3‌2−
Statement II: ClO4−can undergo disproportionation reaction under acidic condition. In the light of the above statements, choose the most appropriate answer from the options given below :

[31-Jan-2024 Shift 2]

Q.16 Correct

Q.16 In-correct

Q.16 Unattempt

The number of white coloured salts among the following is ................
(A) SrSO4
(B) Mg(NH4)‌PO4
(c) BaCrO4
(D) Mn(OH)2
(E) PbSO4
(F) PbCrO4
(G) AgBr
(H) PbI2
(I) CaC2O4
(J) [Fe(OH)2(CH3‌COO)]

[1-Feb-2024 Shift 1]

The number of white coloured salts among the following is ................
(A) SrSO4
(B) Mg(NH4)‌PO4
(c) BaCrO4
(D) Mn(OH)2
(E) PbSO4
(F) PbCrO4
(G) AgBr
(H) PbI2
(I) CaC2O4
(J) [Fe(OH)2(CH3‌COO)]

Which of the following reactions are disproportionation reactions?
(A) Cu+⟶Cu2++Cu
(B) 3MnO42−+4H+⟶2MnO4−+MnO2+2H2O
(C) 2KMnO4⟶K2MnO4+MnO2+O2
(D) 2MnO4−+3Mn2++2H2O⟶5MnO2+4H+
Choose the correct answer from the options given below:

[1-Feb-2024 Shift 1]

Which of the following reactions are disproportionation reactions?
(A) Cu+⟶Cu2++Cu
(B) 3MnO42−+4H+⟶2MnO4−+MnO2+2H2O
(C) 2KMnO4⟶K2MnO4+MnO2+O2
(D) 2MnO4−+3Mn2++2H2O⟶5MnO2+4H+
Choose the correct answer from the options given below:

In acidic medium, K2Cr2O7 shows oxidising action as represented in the half reaction
Cr2O72−+XH++Ye−⟶2A+ZH2O
X,Y,Z and A are respectively are:

[1-Feb-2024 Shift 1]

In acidic medium, K2Cr2O7 shows oxidising action as represented in the half reaction
Cr2O72−+XH++Ye−⟶2A+ZH2O
X,Y,Z and A are respectively are:

Given below are two statements :
Statement (I) : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.
Statement (II) : In this titration phenolphthalein can be used as indicator.
In the light of the above statements, choose the most appropriate answer from the options given below:

[1-Feb-2024 Shift 1]

Given below are two statements :
Statement (I) : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.
Statement (II) : In this titration phenolphthalein can be used as indicator.
In the light of the above statements, choose the most appropriate answer from the options given below:

Match the List-I with List-II :

[25-Jan-2023 Shift 1]

Match the List-I with List-II :

[25-Jan-2023 Shift 1]

Q.21 Correct

Q.21 In-correct

Q.21 Unattempt

In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?

[30-Jan-2023 Shift 1]

In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?

[30-Jan-2023 Shift 1]

Q.22 Correct

Q.22 In-correct

Q.22 Unattempt

Formulae for Nessler's reagent is:

[30-Jan-2023 Shift 2]

Formulae for Nessler's reagent is:

[30-Jan-2023 Shift 2]

Q.23 Correct

Q.23 In-correct

Q.23 Unattempt

Given below are two statements:
Statement I : Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement II : The green colour observed is due to the formation of copper(I) metaborate.
In the light of the above statements, choose the most appropriate answer from the options given below :

[31-Jan-2023 Shift 2]

Given below are two statements:
Statement I : Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement II : The green colour observed is due to the formation of copper(I) metaborate.
In the light of the above statements, choose the most appropriate answer from the options given below :

[31-Jan-2023 Shift 2]

Q.24 Correct

Q.24 In-correct

Q.24 Unattempt

Formation of which complex, among the following, is not a confirmatory test of Pb2+ ions

[6-Apr-2023 shift 2]

Formation of which complex, among the following, is not a confirmatory test of Pb2+ ions

In the wet tests for detection of various cations by precipitation, Ba2+ cations are detected by obtaining precipitate of :

[13-Apr-2023 shift 2]

In the wet tests for detection of various cations by precipitation, Ba2+ cations are detected by obtaining precipitate of :

[13-Apr-2023 shift 2]

Q.26 Correct

Q.26 In-correct

Q.26 Unattempt

During the qualitative analysis of salt with cation y2+, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y2+) present respectively are :

[24-Jun-2022-Shift-1]

During the qualitative analysis of salt with cation y2+, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y2+) present respectively are :

[24-Jun-2022-Shift-1]

Q.27 Correct

Q.27 In-correct

Q.27 Unattempt

Which of the following is structure of a separating funnel?

[27-Jun-2022-Shift-1]

Which of the following is structure of a separating funnel?

[27-Jun-2022-Shift-1]

Q.28 Correct

Q.28 In-correct

Q.28 Unattempt

Choose the correct answer from the options given below :

[27-Jun-2022-Shift-2]

Choose the correct answer from the options given below :

[27-Jun-2022-Shift-2]

Q.29 Correct

Q.29 In-correct

Q.29 Unattempt

A white precipitate was formed when BaCl2 was added to water extract of an inorganic salt. Further, a gas ' X ' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is

[29-Jun-2022-Shift-2]

A white precipitate was formed when BaCl2 was added to water extract of an inorganic salt. Further, a gas ' X ' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is

[29-Jun-2022-Shift-2]

Q.30 Correct

Q.30 In-correct

Q.30 Unattempt

Seliwanoff test and xanthoproteic test are used for the identification of and respectively.

[26 Feb 2021 Shift 2]

Seliwanoff test and xanthoproteic test are used for the identification of and respectively.

[26 Feb 2021 Shift 2]

Q.31 Correct

Q.31 In-correct

Q.31 Unattempt

Which of the following is a false statement?

[26 Feb 2021 Shift 1]

Which of the following is a false statement?

[26 Feb 2021 Shift 1]

Q.32 Correct

Q.32 In-correct

Q.32 Unattempt

Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?

[25 Feb 2021 Shift 2]

Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?

[25 Feb 2021 Shift 2]

Q.33 Correct

Q.33 In-correct

Q.33 Unattempt

Consider titration of NaOH solution versus 1.25M oxalic acid solution. At the end point following burette readings were obtained.
(i) 4.5mL
(ii) 4.5mL
(iii) 4.4mL
(iv) 4.4mL
(v) 4.4mL
If the volume of oxalic acid taken was 10.0mL, then the molarity of the NaOH solution is .......... M. (Rounded off to the nearest integer)

[25 Feb 2021 Shift 2]

Consider titration of NaOH solution versus 1.25M oxalic acid solution. At the end point following burette readings were obtained.
(i) 4.5mL
(ii) 4.5mL
(iii) 4.4mL
(iv) 4.4mL
(v) 4.4mL
If the volume of oxalic acid taken was 10.0mL, then the molarity of the NaOH solution is .......... M. (Rounded off to the nearest integer)

[25 Feb 2021 Shift 2]

Q.34 Correct

Q.34 In-correct

Q.34 Unattempt

0.4g mixture of NaOH,Na2CO3 and some inert impurities was first titrated with ‌

N

10

HCl using phenolphthalein as an indicator, 17.5mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5mL of same HCl was required for the next end point. The weight percentage of Na2CO3 in the mixture is .............. (Rounded off to the nearest integer).

[25 Feb 2021 Shift 1]

0.4g mixture of NaOH,Na2CO3 and some inert impurities was first titrated with ‌

N

10

HCl using phenolphthalein as an indicator, 17.5mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5mL of same HCl was required for the next end point. The weight percentage of Na2CO3 in the mixture is .............. (Rounded off to the nearest integer).

[25 Feb 2021 Shift 1]

Q.35 Correct

Q.35 In-correct

Q.35 Unattempt

The reaction of cyanamide, NH2CN(s) with oxygen was run in a bomb calorimeter and ∆U was found to be −742.24kJmol−1. The magnitude of ∆H298 for the reaction NH2CN(s)+‌

3

2

O2(g)⟶N2(g)+O2(g)+H2O(l) is ............. kJ (Rounded off to the nearest integer).
[Assume ideal gases and
R=8.314Jmol−1K−1 ]

[25 Feb 2021 Shift 1]

The reaction of cyanamide, NH2CN(s) with oxygen was run in a bomb calorimeter and ∆U was found to be −742.24kJmol−1. The magnitude of ∆H298 for the reaction NH2CN(s)+‌

3

2

O2(g)⟶N2(g)+O2(g)+H2O(l) is ............. kJ (Rounded off to the nearest integer).
[Assume ideal gases and
R=8.314Jmol−1K−1 ]

[25 Feb 2021 Shift 1]

Q.36 Correct

Q.36 In-correct

Q.36 Unattempt

In the above reaction 3.9g of benzene on nitration gives 4.92g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is ......... %
(Round off to the nearest integer). (Given, atomic mass C:12.0u,H:1.0u, O:16.0u,N:14.0u )

[2021,17 March Shift-I]

In the above reaction 3.9g of benzene on nitration gives 4.92g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is ......... %
(Round off to the nearest integer). (Given, atomic mass C:12.0u,H:1.0u, O:16.0u,N:14.0u )

[2021,17 March Shift-I]

Q.37 Correct

Q.37 In-correct

Q.37 Unattempt

In Duma's method of estimation of nitrogen, 0.1840g of an organic compound gave 30mL of nitrogen collected at 287K and 758mm of Hg pressure. The percentage composition of nitrogen in the compound is (Round off to the nearest integer).
[Given: Aqueous tension at 287K=14mm of Hg ]

[2021, 16 March Shift-II]

In Duma's method of estimation of nitrogen, 0.1840g of an organic compound gave 30mL of nitrogen collected at 287K and 758mm of Hg pressure. The percentage composition of nitrogen in the compound is (Round off to the nearest integer).
[Given: Aqueous tension at 287K=14mm of Hg ]

[2021, 16 March Shift-II]

Q.38 Correct

Q.38 In-correct

Q.38 Unattempt

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH3)2]+per aldehyde group to form silver mirror is (Round off to the nearest integer).

[18 Mar 2021 Shift 2]

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH3)2]+per aldehyde group to form silver mirror is (Round off to the nearest integer).

[18 Mar 2021 Shift 2]

Q.39 Correct

Q.39 In-correct

Q.39 Unattempt

Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?

[27 Aug 2021 Shift 2]

Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?

[27 Aug 2021 Shift 2]

Q.40 Correct

Q.40 In-correct

Q.40 Unattempt

When 10‌mL of an aqueous solution of KMnO4 was titrated in acidic medium, equal volume of 0.1M of an aqueous solution of ferrous sulphate was required for complete discharge of colour.
The strength of KMnO4 in g∕L is........×10−2. (Nearest integer)
[Atomic mass of K=39,Mn=55,O=16]

[27 Aug 2021 Shift 1]

When 10‌mL of an aqueous solution of KMnO4 was titrated in acidic medium, equal volume of 0.1M of an aqueous solution of ferrous sulphate was required for complete discharge of colour.
The strength of KMnO4 in g∕L is........×10−2. (Nearest integer)
[Atomic mass of K=39,Mn=55,O=16]

[27 Aug 2021 Shift 1]

Q.41 Correct

Q.41 In-correct

Q.41 Unattempt

The OH− concentration in a mixture of 5.0‌mL of 0.0504MNH4‌Cl and 2‌mL of 0.0210MNH3 solution is x×10−6M. The value of x is (Nearest integer)
[Given, Kw=1×10−14 and Kb=1.8×10−5]

[26 Aug 2021 Shift 1]

The OH− concentration in a mixture of 5.0‌mL of 0.0504MNH4‌Cl and 2‌mL of 0.0210MNH3 solution is x×10−6M. The value of x is (Nearest integer)
[Given, Kw=1×10−14 and Kb=1.8×10−5]

[26 Aug 2021 Shift 1]

Q.42 Correct

Q.42 In-correct

Q.42 Unattempt

Given below are two statements.
Statement I In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below.

[26 Aug 2021 Shift 1]

Given below are two statements.
Statement I In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below.

[26 Aug 2021 Shift 1]

Q.43 Correct

Q.43 In-correct

Q.43 Unattempt

An inorganic Compound 'X' on treatment with concentrated H2SO4 produces brown fumes and gives dark brown ring with FeSO4 in presence of concentrated H2SO4. Also Compound ' X′ gives precipitate 'Y', when its solution in dilute HCl is treated with H2S gas. The precipitate ' Y′ on treatment with concentrated HNO3 followed by excess of NH4OH further gives deep blue coloured solution, Compound ' X′ is:

[20 Jul 2021 Shift 1]

An inorganic Compound 'X' on treatment with concentrated H2SO4 produces brown fumes and gives dark brown ring with FeSO4 in presence of concentrated H2SO4. Also Compound ' X′ gives precipitate 'Y', when its solution in dilute HCl is treated with H2S gas. The precipitate ' Y′ on treatment with concentrated HNO3 followed by excess of NH4OH further gives deep blue coloured solution, Compound ' X′ is:

[20 Jul 2021 Shift 1]

Q.44 Correct

Q.44 In-correct

Q.44 Unattempt

When silver nitrate solution is added to potassium iodide solution then the sol produced is :

[22 Jul 2021 Shift 2]

When silver nitrate solution is added to potassium iodide solution then the sol produced is :

[22 Jul 2021 Shift 2]

Q.45 Correct

Q.45 In-correct

Q.45 Unattempt

To an aqueous solution containing ions such as Al3+,Zn2+,Ca2+,Fe3+,Ni2+,Ba2+ and Cu2+ was added conc. HCl, followed by H2S. The total number of cations precipitated during this reaction is/are :

[27 Jul 2021 Shift 2]

To an aqueous solution containing ions such as Al3+,Zn2+,Ca2+,Fe3+,Ni2+,Ba2+ and Cu2+ was added conc. HCl, followed by H2S. The total number of cations precipitated during this reaction is/are :

[27 Jul 2021 Shift 2]

Q.46 Correct

Q.46 In-correct

Q.46 Unattempt

Which one of the following set of elements can be detected using sodium fusion extract ?

[27 Jul 2021 Shift 2]

Which one of the following set of elements can be detected using sodium fusion extract ?

[27 Jul 2021 Shift 2]

Q.47 Correct

Q.47 In-correct

Q.47 Unattempt

Match List-I with List-II.

The correct match is

[2021]

Match List-I with List-II.

The correct match is

[2021]

Q.48 Correct

Q.48 In-correct

Q.48 Unattempt

A, B and C are three biomolecules. The results of the tests performed on them are given below:

A, B and C are respectively:

[Jan. 09, 2020 (II)]

A, B and C are three biomolecules. The results of the tests performed on them are given below:

A, B and C are respectively:

The strength of an aqueous NaOH solution is most accurately determined by titrating: (Note: consider that an appropriate indicator is used)

[Jan. 08, 2020 (I)]

The strength of an aqueous NaOH solution is most accurately determined by titrating: (Note: consider that an appropriate indicator is used)

Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?

[Jan. 08,2020(II)]

Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?

A solution of m -chloroaniline, m -chlorophenol and m chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of NaHCO3 to give fraction A. The left over organic phase was extracted with dilute NaOH solution to give fraction B. The final organic layer was labelled as fraction C. Fractions A,B and C, contain respectively:

[Jan. 07, 2020 (I)]

A solution of m -chloroaniline, m -chlorophenol and m chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of NaHCO3 to give fraction A. The left over organic phase was extracted with dilute NaOH solution to give fraction B. The final organic layer was labelled as fraction C. Fractions A,B and C, contain respectively:

Consider the following reaction:

OH−

──────▶

⋅X
The product ' X is used:
[Jan. 07,2020(I)]

Consider the following reaction:

OH−

──────▶

⋅X
The product ' X is used:
[Jan. 07,2020(I)]

Q.53 Correct

Q.53 In-correct

Q.53 Unattempt

A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acctophenone. When the column is eluted with a mixture of solvents, hexane: ethyl acetate (20:80), the sequence of obtained compounds is:

[Jan. 07,2020 (II)]

A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acctophenone. When the column is eluted with a mixture of solvents, hexane: ethyl acetate (20:80), the sequence of obtained compounds is:

Consider the following reactions:

'A' is :

[Sep. 06, 2020 (I)]

Consider the following reactions:

The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products?

[Sep. 03,2020(I)]

The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products?

In Carius method of estimation of halogen, 0.172g of an organic compound showed presence of 0.08g of bromine. Which of these is the correct structure of the compound?

[Sep.02,2020(I)]

In Carius method of estimation of halogen, 0.172g of an organic compound showed presence of 0.08g of bromine. Which of these is the correct structure of the compound?

While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?

[Sep. 02,2020(I)]

While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?

If you spill a chemical toilet cleaning liquid on your hand, your first aid would be:

[Sep. 02,2020 (II) ]

If you spill a chemical toilet cleaning liquid on your hand, your first aid would be:

Two compounds A and B with same molecular formula (C3H6O) undergo Grignard's reaction with methyl-magnesium bromide to give products C and D. Products C and D show following chemical tests.

C and D respectively are:
[Sep. 02,2020 (II)]

Two compounds A and B with same molecular formula (C3H6O) undergo Grignard's reaction with methyl-magnesium bromide to give products C and D. Products C and D show following chemical tests.

C and D respectively are:
[Sep. 02,2020 (II)]

Q.61 Correct

Q.61 In-correct

Q.61 Unattempt

The correct match between items I and I is :

[Jan. 11, 2019(I)]

The correct match between items I and I is :

An organic compound is estimated through Dumas method and was found to evolve 6 moles of CO2,4 moles of H2O and 1 mole of nitrogen gas. The formula of the compound is:

[Jan. 11,2019(I)]

An organic compound is estimated through Dumas method and was found to evolve 6 moles of CO2,4 moles of H2O and 1 mole of nitrogen gas. The formula of the compound is:

The correct match between Item I and Item II is:

[Jan. 11,2019(II)]

The correct match between Item I and Item II is:

Which of the following compounds will produce a precipitate with AgNO3?

[Jan. 11, 2019(II)]

Which of the following compounds will produce a precipitate with AgNO3?

If dichloromethane (DCM) and water (H2O) are used for differential extraction, which one of the following statements is correct?

[Jan. 10, 2019(I)]

If dichloromethane (DCM) and water (H2O) are used for differential extraction, which one of the following statements is correct?

The correct match between item 'I' and item 'II' is:

[Jan. 10,2019 (II)]

The correct match between item 'I' and item 'II' is:

Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:

[Jan. 10,2019 (II)]

Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:

Which of the following tests cannot be used for identifying amino acids?

[Jan. 10,2019(II)]

Which of the following tests cannot be used for identifying amino acids?

The correct match between Item-I and Item-II is:

[Jan. 9,2019 (I)]

The correct match between Item-I and Item-II is:

The correct match between Item I and Item II is:

[Jan. 9,2019(II)]

The correct match between Item I and Item II is:

The tests performed on compound X and their inferences are:

Compound 'X' is:
[Jan .9,2019(II)]

The tests performed on compound X and their inferences are:

Compound 'X' is:
[Jan .9,2019(II)]

Q.72 Correct

Q.72 In-correct

Q.72 Unattempt

An organic compound ' A ' is oxidized with Na2O2 followed by boiling with HNO3. The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on above observation, the element present in the given compound is:

[April 12, 2019 (I)]

An organic compound ' A ' is oxidized with Na2O2 followed by boiling with HNO3. The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on above observation, the element present in the given compound is:

Which one of the following is likely to give a precipitate with AgNO3 solution?

[April 12, 2019 (II)]

Which one of the following is likely to give a precipitate with AgNO3 solution?

[April 12, 2019 (II)]

Q.74 Correct

Q.74 In-correct

Q.74 Unattempt

The principle of column chromatography is:

[ April 10,2019,(I)]

The principle of column chromatography is:

In chromatography, which of the following statement is INCORRECT for Rr ?

[April 10,2019 (II)]

In chromatography, which of the following statement is INCORRECT for Rr ?

The organic compound that gives following qualitative analysis is:

[April9,2019(I)]

The organic compound that gives following qualitative analysis is:

An organic compound 'X' showing the following solubility profile is:

[April 8,2019 (I)]

An organic compound 'X' showing the following solubility profile is:

Which of the following compounds will be suitable for Kjeldahl's method for nitrogen estimation?

[2018]

Which of the following compounds will be suitable for Kjeldahl's method for nitrogen estimation?

An alkali is titrated against an acid with methyl orange as indicator, which of the following in a correct combination?

[2018]

An alkali is titrated against an acid with methyl orange as indicator, which of the following in a correct combination?

For standardizing NaOH solution, which of the following is used as a primary standard?

[Online April 16,2018]

For standardizing NaOH solution, which of the following is used as a primary standard?

[Online April 16,2018]

Q.81 Correct

Q.81 In-correct

Q.81 Unattempt

In a complexometric tritration of metal ion with ligand M(Metal ion) +L( Ligand )⟶C( Complex ) end point is estimated spectrophotometrically (through light absorption) If'M' and 'C' do not absorb light and only 'L' absorbs, then the titration plot between absorbed light (A) versus volume of ligand 'L' (V) would look like:

[Online April 16, 2018]

In a complexometric tritration of metal ion with ligand M(Metal ion) +L( Ligand )⟶C( Complex ) end point is estimated spectrophotometrically (through light absorption) If'M' and 'C' do not absorb light and only 'L' absorbs, then the titration plot between absorbed light (A) versus volume of ligand 'L' (V) would look like:

[Online April 16, 2018]

Q.82 Correct

Q.82 In-correct

Q.82 Unattempt

The incorrect statement out of the following is

[Online April 16, 2018]

The incorrect statement out of the following is

[Online April 16, 2018]

Q.83 Correct

Q.83 In-correct

Q.83 Unattempt

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the aforementioned solution, a white precipitate is obtained which does not dissolve in dil. nitric acid. The anion is :

[Online April 15, 2018 (I)]

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the aforementioned solution, a white precipitate is obtained which does not dissolve in dil. nitric acid. The anion is :

[Online April 15, 2018 (I)]

Q.84 Correct

Q.84 In-correct

Q.84 Unattempt

The correct match between items of List-I and List-II is :

[Online April 15,2018(I)]

The correct match between items of List-I and List-II is :

[Online April 15,2018(I)]

Q.85 Correct

Q.85 In-correct

Q.85 Unattempt

A solution containing a group-IV cation gives a precipitate on passing H2S. A solution of this precipitate in dil.HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is:

[Online April 8,2017]

A solution containing a group-IV cation gives a precipitate on passing H2S. A solution of this precipitate in dil.HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is:

[Online April 8,2017]

Q.86 Correct

Q.86 In-correct

Q.86 Unattempt

The hottest region of Bunsen flame shown in the figure below is:

[2016]

The hottest region of Bunsen flame shown in the figure below is:

An aqueous solution of a salt X turns blood red on treatment with CNS ‌− and blue on treatment with K4[Fe(CN)6].X also gives a positive chromyl chloride test. The salt X is:

[Online April 10, 2015]

An aqueous solution of a salt X turns blood red on treatment with CNS ‌− and blue on treatment with K4[Fe(CN)6].X also gives a positive chromyl chloride test. The salt X is:

[Online April 10, 2015]

Q.88 Correct

Q.88 In-correct

Q.88 Unattempt

The cation that will not be precipitated by H2S in the presence of dil. HCl is:

[Online April 10,2015]

The cation that will not be precipitated by H2S in the presence of dil. HCl is:

[Online April 10,2015]

Q.89 Correct

Q.89 In-correct

Q.89 Unattempt

A pink coloured salt turns blue on heating. The presence of which cation is most likely?

[Online April 11, 2015]

A pink coloured salt turns blue on heating. The presence of which cation is most likely?

[Online April 11, 2015]

Q.90 Correct

Q.90 In-correct

Q.90 Unattempt

Match the organic compounds in column-I with the Lassaigne's test results in column-II appropriately:

[Online April 11,2015]

Match the organic compounds in column-I with the Lassaigne's test results in column-II appropriately:

[Online April 11,2015]

Q.91 Correct

Q.91 In-correct

Q.91 Unattempt

For the estimation of nitrogen, 1.4g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60mL of ‌

M

10

sulphuric acid. The unreacted acid required 20mL of ‌

M

10

sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:

[Online April 10,2015,2014]

For the estimation of nitrogen, 1.4g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60mL of ‌

M

10

sulphuric acid. The unreacted acid required 20mL of ‌

M

10

sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:

[Online April 10,2015,2014]

Q.92 Correct

Q.92 In-correct

Q.92 Unattempt

Sodium Carbonate cannot be used in place of (NH4)2CO3 for the identification of Ca2+,Ba2+ and Sr2+ ions (in group V) during mixture analysis because :

[Online April 9,2013]

Sodium Carbonate cannot be used in place of (NH4)2CO3 for the identification of Ca2+,Ba2+ and Sr2+ ions (in group V) during mixture analysis because :

[Online April 9,2013]

Q.93 Correct

Q.93 In-correct

Q.93 Unattempt

Which of the following statements is incorrect?

[Online April 22, 2013]

Which of the following statements is incorrect?

[Online April 22, 2013]

Q.94 Correct

Q.94 In-correct

Q.94 Unattempt

Copper wire test for halogens is known as

[Online May 7, 2012]

Copper wire test for halogens is known as

Beilstein test is used for the estimation of which one of the following elements?

[Online May 19,2012]

Beilstein test is used for the estimation of which one of the following elements?

29.5mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20mL of 0.1MHCl solution. The excess of the acid required 15mL of 0.1MNaOH solution for complete neutralization. The percentage of nitrogen in the compound is

[2010]

29.5mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20mL of 0.1MHCl solution. The excess of the acid required 15mL of 0.1MNaOH solution for complete neutralization. The percentage of nitrogen in the compound is

An organic compound having molecular mass 60 is found to contain C=20%,H=6.67% and N=46.67% while rest is oxygen. On heating it gives NH3 alongwith a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is

[2005]

An organic compound having molecular mass 60 is found to contain C=20%,H=6.67% and N=46.67% while rest is oxygen. On heating it gives NH3 alongwith a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is

The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

[2004]

The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

Which one of the following statements is correct?

[2003]

Which one of the following statements is correct?

When H2S is passed through Hg2S we get

[2002]

When H2S is passed through Hg2S we get

How do we differentiate between Fe3+ and Cr3+ in group III?

[2002]

How do we differentiate between Fe3+ and Cr3+ in group III?

[2002]