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Chemistry Test 263
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Chemistry Test 263
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  • Question 1/10
    4 / -1

    Directions For Questions

    Directions: Questions are based on the following paragraph.

    When ammonium vanadate is heated with oxalic add solution, a compound Z is formed. A sample of Z was titrated with KMnO4 solution in hot acidic solution. The resulting liquid was reduced with SO2, the excess SO2 boiled off, and the liquid again titrated with KMnO4. The ratio of the volumes of KMnO4 used in the two titrations was 5 : 1. KMnO4 oxidises all oxidation state of vanadium to Vanadium (+V) and SO2 reduces vanadium (+V) to vanadium (+IV). Read the above experiment and answer the following questions.

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    If vanadium exists as  reduced species by SO2 would be

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  • Question 2/10
    4 / -1

    In a cubic dosed packed structure of mixed oxides, the lattice is made up of oxide ions, one eighth of tetrahedral/voids are occupied by divalent ions (A2+), while one half of the octahedral voids are occupied by trivalent ions(B3+)What is the formula of the oxide ?

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  • Question 3/10
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    Which of the following sequence of reaction is the best means to furnish the conversion RCH2OH→RCH2NH2

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  • Question 4/10
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    The standard heat of combustion of carbon(s), sulphur (s) and carbon disulphide (l) are -393.3, -293.72 and - 1108.76 kJ/mol respectively. The standard heat of formation of carbon disulphide(l) is

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  • Question 5/10
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    The volume of 0.1 M oxalic acid that can be completely oxidised by 20 mL of 0.025 M KMnO4 solution is

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  • Question 6/10
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    α-D(+)-glucose and β-D-(+)-glucose are

    Solutions

    Anomers are diastereo isomers of cyclic forms of sugars or similar molecules differing in the configuration at the anomeric carbon (C-1 atom of aldose or the  C-2 atom of a 2-ketose).The cyclic forms of carbohydrates can exist in two forms , α – and β- based on the position of the substituent at the anomeric centre.

     

  • Question 7/10
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    Match List I with List II and select the correct answer using the codes given below the lists:

    Solutions

    Cyanide process is used for the extraction of Au, floatation process uses pine oil as a foaming agent, electrolytic reduction is used in the extraction of Al and zone refining process produces ultra pure Ge.

     

  • Question 8/10
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    Which one of the following is the structure of polyacrylonitrile?

    Solutions

    Polyacrylonitrile has molecular formula (C3H3N)n.

     

  • Question 9/10
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    The state of hybrization of carbons 1,3 and 5 are in the following sequence :

    Solutions

    Among the four (I) and (II) have chirality . so, here, optical isomers are obtained.

     

  • Question 10/10
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