Question

Column I		Column II
A	Acidic salt	p	$pH=\frac{1}{2}\left(p{K}_w-p{K}_b-\log C\right)$
B	Basic salt	q	$pH=\frac{1}{2}\left(p{K}_w+p{K}_b+\log C\right)$
C	Acidic buffer	r	$pOH=p{K}_b+\log \frac{\text{ [Salt }]}{[\text{ Base }]}$
D	Basic buffer	s	$pH=p{K}_a+\log \frac{[\text{ Salt }]}{[\text{ Base }]}$

• A. A - (q), B - (r), C - (p), D - (s)
• B. A - (r), B - (s), C - (q), D - (p)
• C. A - (s), B - (p), C - (r), D - (q)
• D. A - (p), B - (q), C - (s), D - (r)

Answer 1

Answer: (D)

$(a\to p)$ Acidic salt: aqueous solution of salt is acidic
$(pH<7)pH=\frac{1}{2}\left(p{K}_w-p{K}_b-\log C\right)$
$(b\to q)$ Basic salt: Aqueous solution of salt is basic
$(pH>7)pH=\frac{1}{2}\left(p{K}_w+p{K}_b+\log C\right)$
$(c\to s)$ Acidic buffer: $pH=p{K}_a+\log \frac{\text{ [Salt }]}{[\text{ Acid }]}$
$(d\to r)$ Basic buffer: $pOH=p{K}_b+\log \frac{[\text{ Salt }]}{[\text{ Base }]}$