21.

The hydrogen electrode is dipped in a solution of pH = 3 at 25°C. The potential of the cell would be [use value of $\frac{2.303 \mathrm{RT}}{\mathrm{F}}$ = 0.59 V]

• 0.059 V

• 0.088 V

• 0.178 V

• -0.177 V

Reaction between compounds (A) and (B) occurs as follows

A (g) + 2B (g) → 2C (g)

Following results were obtained

The correct rate- law for the said reaction is (r and k rate and rate constant respectively)

• r = k[A]²B

• r = k[A][B]²

• r = k[A][B]

• r = k[A]²[B]²

In the reaction 2NO₂ $\underset{{\mathrm{k}}_2}{\overset{{\mathrm{k}}_1}{\rightleftharpoons }}$ N₂O₄; the rate of disappearance of NO₂ is equal to

• 2$\frac{{\mathrm{k}}_1}{{\mathrm{k}}_2}$ [NO₂]²

• 2k₁[NO₂]² - 2k₂[N₂O₄]

• 2k₂[NO₂]² - k₂[N₂O₄]

• (2k₁ - k₂)[NO₂]

The rate constant for the raection 2N₂O₅ → 4NO₂ + O₂ is 3.0 × 10^-5 s^-1. If rate is 2.40 × 10^-5, then concentration of N₂O₅ (in mol/L) is

• 1.4

• 1.2

• 0.04

• 0.8

What is the end product for the reaction?

Number of chiral centers in the following image is/ are

• 1

• 2

• 3

• 4

In the following reaction

The main product (P) is

In the reaction,

CH₃-CH₂-Cl $\stackrel{\mathrm{KCN}}{\to }$ (A) $\stackrel{\mathrm{Complete} \mathrm{hydrolysis}}{\to }$(B), end product (B) is

• CH₃ - CH₂ - CN

• CH₃ - CH₂ - CONH₂

• CH₃ - CH₂ - COOH

• CH₃ - CH₂ - CH₂ - CH₂ - CN

The main product (P) is

• C₆H₅OC₂H₅

• C₂H₅OC₂H₅

• C₆H₅OC₆H₅

• C₆H₅.I

On Friedal Crafts acetylation, anisol yields

• 2-methoxyacetophenone

• 4-methoxyacetophenone

• Both (a) and (b)

• None of the above