CBSE Class 12 Chemistry Compartment Question Paper 2014 Set 56 3

CBSE CLASS XII Questions

• 1.

  (a) Define 'Denatured Protein' with an example.

  (b) What happens when glucose reacts with HCN ? Write the reaction involved.

  (c) Name the disease caused by the deficiency of Vitamin C.

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• 2.

  Conductivity of \( 2.5 \times 10^{-4} \) M methanoic acid solution is \( 5.25 \times 10^{-5} \) S cm\(^{-1}\).

  (a) Calculate its molar conductivity.

  (b) Calculate its degree of dissociation.

  [Given : \( \lambda^{\circ}_{(\mathrm{H^+})} = 349.5 \) S cm\(^2\) mol\(^{-1}\) and \( \lambda^{\circ}_{(\mathrm{HCOO^-})} = 50.5 \) S cm\(^2\) mol\(^{-1}\)]

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• 3.

  A reaction \( \mathrm{A \rightarrow B} \) follows second order kinetics. How will the rate of reaction be affected if the concentration of (i) A is increased by three times, and (ii) A is reduced to half ?

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• 4.

  (a) Write two structural differences between DNA and RNA.

  (b) Which component of starch is a branched chain polymer of \( \alpha \)-D-(+)-glucose ? Write its one characteristic feature.

  (c) Which types of bonds hold the polypeptide chains in fibrous proteins ?

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• 5.

  Draw the structures of major monohalo products in each of the following :

  (a)

  (b)

  
  

  

  
  

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• 6.

  (a) What are anomers ? Explain.

  (b) What happens when glucose reacts with hydroxylamine ? Write the reaction involved.

  (c) Name the disease caused by the deficiency of Vitamin B\(_{12}\).

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