Question

Dilution processes of different aqueous solutions, with water, are given in LIST-I. The effects of dilution of the solutions on $\left[\mathrm{H}^{+}\right]$ are given in LIST-II.

(Note: Degree of dissociation $(\alpha)$ of weak acid and weak base is << 1; degree of hydrolysis of salt <<1; $\left[\mathrm{H}^{+}\right]$ represents the concentration of $\mathrm{H}^{+}$ ions)

| LIST-I | LIST-II |
|--------|--------|
| P. (10 mL of $0.1\mathrm{M}\mathrm{NaOH}+20\mathrm{~mL}$ of 0.1 M acetic acid) diluted to 60 mL | 1. the value of $\left[\mathrm{H}^{+}\right]$ does not change on dilution |
| Q. (20 mL of $0.1\mathrm{M}\mathrm{NaOH}+20\mathrm{~mL}$ of 0.1 M acetic acid) diluted to 80 mL | 2. the value of $\left[\mathrm{H}^{+}\right]$ changes to half of its initial value on dilution |
| R. (20 mL of $0.1\mathrm{M}\mathrm{HCl}+20\mathrm{~mL}$ of 0.1 M ammonia solution) diluted to 80 mL | 3. the value of $\left[\mathrm{H}^{+}\right]$ changes to two times of its initial value on dilution |
| S. 10 mL saturated solution of $\mathrm{Ni}(\mathrm{OH})_{2}$ in equilibrium with excess solid $\mathrm{Ni}(\mathrm{OH})_{2}$ is diluted to 20 mL (solid $\mathrm{Ni}(\mathrm{OH})_{2}$ is still present after dilution). | 4. the value of $\left[\mathrm{H}^{+}\right]$ changes to $\frac{1}{\sqrt{2}}$ times of its initial value on dilution |
| | 5. the value of $\left[\mathrm{H}^{+}\right]$ changes to $\sqrt{2}$ times of its initial value on dilution |

Match each process given in LIST-I with one or more effect(s) in LIST-II. The correct option is

Accepted Answer

(D) $\mathbf{P} \rightarrow 1; \mathbf{Q} \rightarrow 5; \mathbf{R} \rightarrow 4; \mathbf{S} \rightarrow 1$

Answer

(A) $\mathbf{P} \rightarrow 4; \mathbf{Q} \rightarrow 2; \mathbf{R} \rightarrow 3; \mathbf{S} \rightarrow 1$

Answer

(B) $\mathbf{P} \rightarrow 4; \mathbf{Q} \rightarrow 3; \mathbf{R} \rightarrow 2; \mathbf{S} \rightarrow 3$

Answer

(C) $\mathbf{P} \rightarrow 1; \mathbf{Q} \rightarrow 4; \mathbf{R} \rightarrow 5; \mathbf{S} \rightarrow 3$

LIST-I	LIST-II
P. (10 mL of $0.1 M NaOH + 20 mL$ of 0.1 M acetic acid) diluted to 60 mL	1. the value of $[H^{+}]$ does not change on dilution
Q. (20 mL of $0.1 M NaOH + 20 mL$ of 0.1 M acetic acid) diluted to 80 mL	2. the value of $[H^{+}]$ changes to half of its initial value on dilution
R. (20 mL of $0.1 M HCl + 20 mL$ of 0.1 M ammonia solution) diluted to 80 mL	3. the value of $[H^{+}]$ changes to two times of its initial value on dilution
S. 10 mL saturated solution of $Ni (OH)_{2}$ in equilibrium with excess solid $Ni (OH)_{2}$ is diluted to 20 mL (solid $Ni (OH)_{2}$ is still present after dilution).	4. the value of $[H^{+}]$ changes to $\frac{1}{2}$ times of its initial value on dilution
	5. the value of $[H^{+}]$ changes to $2$ times of its initial value on dilution

JEE Advanced · 2018 · 20 May 2018 · Paper 2 · Equilibrium

Solution

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