COMEDK · Chemistry · 8. Ionic Equilibrium
Which of the following salts on being dissolved in water gives \(\mathrm{pH}>7\) at \(25^{\circ} \mathrm{C}\) ?
- A \(\mathrm{NH}_{4} \mathrm{CN}\)
- B \(\mathrm{NH}_{4} \mathrm{Cl}\)
- C \(\mathrm{KNO}_{3}\)
- D \(\mathrm{KCN}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{KCN}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{KCN}\) is a sait of strong base \((\mathrm{KOH})\) and weak acid \(\{\mathrm{HCN})\), \[ \mathrm{KCN}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \underset{\substack{\text { Strung } \\ \text { base }}}{\mathrm{KOH}}+\underset{\text { Weak aesd }}{\mathrm{HCN}} \]…
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