Question

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	$C{H}_{3}COONa$	(i)	Almost neutral, $pH>7$ or $<7$
(B)	$N{H}_{4}Cl$	(ii)	Acidic, $pH<7$
(C)	$NaN{O}_3$	(iii)	Alkaline, $pH>7$
(D)	$C{H}_{3}COON{H}_4$	(iii)	Neutral, $pH=7$

• A. $(A)\to (i)$, $(B)\to (ii)$, $(C)\to (iii)$, $(D)\to (iv)$
• B. $(A)\to (ii)$, $(B)\to (iii)$, $(C)\to (iv)$, $(D)\to (i)$
• C. $(A)\to (iii)$, $(B)\to (ii)$, $(C)\to (iv)$, $(D)\to (i)$
• D. $(A)\to (iv)$, $(B)\to (i)$, $(C)\to (iii)$, $(D)\to (ii)$

Answer 1

Answer: (C)

(A) $C{H}_{3}COONa\rightleftharpoons \underset{\text{Weak acid}}{C{H}_{3}CO{O}^{-}}+\underset{\text{Strong base}}{N{a}^{+}}$ (Basic)
(B) $N{H}_{4}Cl\rightleftharpoons \underset{\text{Weak base}}{N{H}_4^{+}}+\underset{\text{Strong acid}}{C{l}^{-}}$ (Acidic)
(C) $NaN{O}_3\rightleftharpoons \underset{\text{Strong base}}{N{a}^{+}}+\underset{\text{Strong acid}}{N{O}_3^{-}}$ (Neutral)
(D) $C{H}_{3}COON{H}_4\rightleftharpoons \underset{\text{Weak acid}}{C{H}_{3}CO{O}^{-}}+\underset{\text{Weak base}}{N{H}_4^{+}}$ (Almost neutral)
May be slightly acidic or basic depending upon $p{K}_a$ and $p{K}_b$ values of acid and base.