Question

Which of the following statements is/are correct?

• A. The conjugate acid of $N{H}_2^{-}$ is $N{H}_3$
• B. Solubility product constant increases with increase in concentration of ions
• C. On diluting a buffer solution $pH$ change is zero
• D. In alkaline buffer solution, if some $HCl$ is added, its $\left[O{H}^{-}\right]$ will increase

Answer 1

Answer: (A), (C)

The correct options are
A The conjugate acid of $N{H}_2^{-}$ is $N{H}_3$
C On diluting a buffer solution $pH$ change is zero

(a) A conjugate acid is formed when a proton is added to a base.
$N{H}_2^{-}+H^{+}\rightleftharpoons N{H}_3$
Hence, option (a) is correct.
(b) Solubility product does not changes on changing the concentration of ions
(c) A buffer solution is a chemical solution which resists change to its $pH$ on adding small amount of acid/base. Hence, $pH$ does not change on dilution.
(d) In alkaline buffer solution, if $HCl$ is added, $H^{+}$ will be consumed by $O{H}^{-}$ to form $H_{2}O$.