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.

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

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

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

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
• C 
• C 

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