Question

$poH=7-0.5p{K}_A+0.5p{K}_b$ is true for which pair of cation and anoin.

• A. $C_6{H}_5{NH}_3^{+},{CH}_3{COO}^{-}$
• B. $N{a}^{+},C{I}^{-}$
• C. $A{I}^{+}3,C{I}^{-}$
• D. ${NH}_4^{+},{NO}_3^{-}$

Answer 1

Answer: (B)

$N{a}^{+},C{I}^{-}$

when $0.5p{K}_A$ is positive it shows acid and when it is negative it shows base

value of $p{K}_A$ is low and equal show strong base and acid

We can see in option B ion $N{a}^{+}$ shows strong base and ion $c{l}^{-}$ shows strong acid