Question

SET -1(pH value) SET-2(Solution)

I) $7$ A) Aqueous solution of 1M $NaOH$

II) $<7$ B) $N{a}_{2}C{O}_3$

III) $>7$ C) $C{H}_{3}COON{H}_4$

IV) $14$ D) None

The correct match is :

• A. $I-B;II-A;III-D;IV-C$
• B. $I-C;II-D;III-B;IV-A$
• C. $I-D;II-C;III-B;IV-A$
• D. $I-A;II-B;III-C;IV-D$

Answer 1

Answer: (B)

$I-C;II-D;III-B;IV-A$

A) $NaOH\to$ strong base
$pH=14$
B) $N{a}_{2}C{O}_3\to$ Anionic hydrolysis
$C{O}_3^{2-}+H_{2}O\to H_{2}C{O}_3+O{H}^{-}$
$\therefore pH>7$
C) $C{H}_{3}COON{H}_4$
Salt of Weak Acid and Weak base with $k_a=k_b$
$\therefore$ Neutral, i.e., $\to$ $pH=7$
D) None have $pH<7$.