Question

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

	Column I		Column II
(A)	$CH_3COONa$	(i)	Almost neutral, $pH > 7$ or $< 7$
(B)	$NH_4Cl$	(ii)	Acidic, $pH < 7$
(C)	$NaNO_3$	(iii)	Alkaline, $pH > 7$
(D)	$CH_3COONH_4$	(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) $\,CH_3COONa \rightleftharpoons \underset{\text{Weak acid}}{CH_3COO^-}+ \underset{\text{Strong base}}{Na^+}$ (Basic)
(B) $\,NH_4Cl \rightleftharpoons \underset{\text{Weak base}}{NH^+_4}+ \underset{\text{Strong acid}}{Cl^-}$ (Acidic)
(C) $\,NaNO_3 \rightleftharpoons \underset{\text{Strong base}}{Na^+}+ \underset{\text{Strong acid}}{NO^{-}_{3}}$ (Neutral)
(D) $\,CH_3COONH_4 \rightleftharpoons \underset{\text{Weak acid}}{CH_3COO^-}+\underset{\text{Weak base}}{NH^{+}_{4}}$ (Almost neutral)
May be slightly acidic or basic depending upon $pK_a$ and $pK_b$ values of acid and base.