Match the following : from Class 12 ISC Previous Year Board Pap

Subject

Chemistry

Class

ICSE Class 12

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsMatch The Following

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1. Match the following :
A. Optical isomerism (i) glycine
B. Zwitter ion (ii)  lactic acid
C. Lewis acid (iii) ebullioscopic method
D. Lewis acid (iv) formaldehyde
E. Urotropine (v) aluminium chloride


A.

Optical isomerism

(i)

 lactic acid

B.

Zwitter ion

(ii)

glycine

C.

Lewis acid

(iii)

ebullioscopic method

D.

Lewis acid

(iv)

aluminium chloride

E.

Urotropine

(v)

formaldehyde
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 Multiple Choice QuestionsFill In the Blanks

2.

 Fill in the blanks by choosing the appropriate words from those given in brackets :   

[Entropy, energy, MnO2, CuO, +M, –M, +I, –I, directly, inversely, sulphuric acid, hydrochloric acid, nitric acid, square, cube, square root, universe, buffer action, salt hydrolysis, acidic, basic, decreases, increases].

(i) When a spontaneous process takes place, it is accompanied by an increase in the total ______of the______.

(ii) The degree of dissociation of a weak electrolyte is______proportional to the______of its molar concentration.

(iii) Sodium acetate solution is______because of________.

(iv) In the laboratory, bromine can be obtained by heating a mixture of KBr and_______with conc. _______.

(v) An alkyl group attached to the carbonyl group exerts a ________effect and thus______the reactivity of carbonyl group.

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 Multiple Choice QuestionsMultiple Choice Questions

3.

Complete the following statements by selecting the correct alternative from the choices given: 

Dehydration of an amide with phosphorus pentoxide yields :

  • Ammonia 

  • Alkyl cyanide

  • Alkyl isocyanide

  • Alkyl amine

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4.

Complete the following statements by selecting the correct alternative from the choices given: 

The lowest freezing point of 0.1 M aqueous solution is of:

  • K2SO4 
  • NaCl
  • Urea
  • Urea
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5.

Complete the following statements by selecting the correct alternative from the choices given: 

A basic buffer can be prepared by mixing :

  • CH3COONa and CH3COOH  
  • Na2SO4 and H2SO4
  • NaCl and NaOH
  • NaCl and NaOH
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6.

Complete the following statements by selecting the correct alternative from the choices given: 

The standard reduction electrode potentials of four elements A, B, C and D are -3.05, 1.66, -0.40 and 0.80 volts respectively. The highest chemical activity will be shown by :

  • A
  • B
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7.

Complete the following statements by selecting the correct alternative from the choices given: 

The solubility of iodine in water may be increased by adding :

  • Potassium iodide 
  • Chloroform
  • Carbon disulphide
  • Carbon disulphide
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 Multiple Choice QuestionsShort Answer Type

8. Correct the following statements :

A system which can exchange neither matter nor energy with the surroundings is called a closed system.
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9. Correct the following statements :

Hydrolysis of an isocyanide in the presence of an acid yields primary amine and methyl alcohol.
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10. Correct the following statements :

Dissociation of hydrogen sulphide is suppressed in an acidic medium because of neutralization.
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