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) $C{H}_{3}COON{H}_4$	(iv) Neutral, pH = $7$

• A. (A) - (i) ; (B) - (ii) ; (C) - (iii) ; (D) - (iv)
• B. (A) - (ii) ; (B) - (iii) ; (C) - (iv) ; (D) - (i)
• C. (A) - (iii) ; (B) - (ii) ; (C) - (iv) ; (D) - (i)
• D. (A) - (iv) ; (B) - (i) ; (C) - (iii) ; (D) - (ii)

Answer 1

Answer: (C)

(A) - (iii) ; (B) - (ii) ; (C) - (iv) ; (D) - (i)

(A) $C{H}_{3}COONa$ sodium acetate undergoes hydrolysis to give a basic solution. alkaline, pH > 7.

(B) $N{H}_{4}Cl$ Ammonium chloride is formed $N{H}_{4}OH$ and $HCl$. It is an acidic salt, pH < 7.

(c) $NaN{O}_3$ sodium nitrate is formed from a strong base ($NaOH$) and a strong acid ($HN{O}_3$) and is a neutral salt pH = 7.

(D) $C{H}_{3}COON{H}_4$ Dissolution of ammonium ethanoate salt in water results in pH 7, but this pH is highly labile. Ammonium acetate does provide buffering around pH 4.75 (the pKa of acetic acid) and around pH 9.25 (the pKa of ammonium).