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Chemistry Test 264
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Chemistry Test 264
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  • Question 1/10
    4 / -1

    For the elementary reaction M → N, the rate of disappearance of M increases by factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is

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  • Question 2/10
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    Calgon used as a water softener is

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  • Question 3/10
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    In which of the following case, increase in concentration of ion cause increase in Ecell?

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  • Question 4/10
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    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.

    ...view full instructions

    What is the oxidation state of vanadium in the compound Z?

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  • Question 5/10
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    Directions For Questions

    Direction: Question is assertion reason type. These question contains two statements Statement I (Assertion), Statement II (Reason). These question also has four alternative choices, only one of which is correct. You have to select the correct choices from the codes (a), (b), (c) and (d) given below:

    ...view full instructions

    Statement I : Detection of chlorine in 2, 4, 6 -trinitrochlorobenzene can be done directly by addition of aq. AgNO3 solution.

    Statement II: C-Cl bond is weakened by electron withdrawing - NO2 group

    Solutions

    2,4, 6 - trinitrocholorobenzene.The presence of electron withdrawing group (like -NO2) makes the nucleophilic aromatic substitution easier, as it decreases the strength of C-Cl bond. Thus,gives ppt. of AgCl with aq. AgNo3

     

  • Question 6/10
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    Silver (atomic weight = 108 g mol-1 ) has a density of 10.5 g cm-3. The number of silver atoms on a surface of area 10-12 m2 can be expressed in scientific notation as y * 10x . The value of x is

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  • Question 7/10
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    Names of some compounds are given. Which one is not correct in IUPAC system?

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  • Question 8/10
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    The structure of isobutyl group in an organic compound is :

    Solutions

    Structure of 1 butene-3yne we know that double bond contains one sigma and one pi-bond while a triple bond contains one sigma and two pi-bonds. So, total number of sigma and pi-bonds.

    = (5+1+1) σ + (0+1+2) π i.e 7σ, 3π

    1-butene-3yne contains 7 sigma and 3 Pi-bonds

     

  • Question 9/10
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    the value of x, y and z in the reaction respectively are

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  • Question 10/10
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    The correct statement about the following disaccharide is

    Solutions

    In the given structures A and B ring A is 6 membered ring containg one oxygen with α – glycosidic linkage, hence it is pyranose where as ring B is 5- membered ring containing one oxygen is furanos with β – glycosidic linkage.

     

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