31.

Considerthe following electrode processes of a cell,

If EMF of this cell is-1.140 V and E° value of the cell is -0.55 V at 298 K, the value of the equilibrium constant of the sparingly soluble salt MCl is in the order of

• 10^-10

• 10^-8

• 10^-7

• 10^-11

Consider the single electrode process 4H⁺ + 4e^- $\rightleftharpoons$ 2H₂ catalysed by platinum black electrode in HCl electrolyte. The potential of the electrode is -0.059 V. SHE. What is the concentration of the acid in the hydrogen half cell if the H₂ pressure is 1 bar?

4H⁺ + 4e^- $\rightleftharpoons$ 2H₂ 

• 1 M

• 10 M

• 0.1 M

• 0.01 M

Which of the following is true for spontaneous adsorption of H₂ gas without dissociation on solid surface.

• Process is exothermic and ΔS <0.

• Process is exothermic and ΔS >0

• Process is endothermic and ΔS <0.

• Process is endothermic and ΔS >0.

The alcohol that reacts faster with Lucas reagent is

• CH₃CH₂CH₂CH₂OH

• CH₃CH₂CHOHCH₃

• CH₃CH(CH₃)CH₂OH

• CH₃ —C₃H₆—OH

Cyclohexylamine and aniline can be distinguished by

• Hinsberg test

• Carbylamine test

• Lassaigne test

• Azo dye test

........... is a potent vasodilator.

• Histamine

• Serotonin

• Codeine

• Cimetidine

The monomers of buna-S rubber are

• lsoprene and butadiene

• Butadiene and phenol

• Styrene and butadiene

• Vinyl chloride and sulphur

Nitration of phenyl benzoate yields the product

Conversion of esters to aldehydes can be accomplished by

• Stephen reduction

• Rosenmund reduction

• Reduction with lithium aluminium hydnde

• Reduction with diisobutyl aluminium hydride

The number of complementary hydrogen bond(s) between a guanine and cytosine

• 2

• 1

• 4

• 3