Chemical And Ionic Equilibrium Result Question 10
10. Which of the following salts is the most basic in aqueous solution?
(2018 Main)
(a) $\mathrm{Al}(\mathrm{CN}) _3$
(b) $\mathrm{CH} _3 \mathrm{COOK}$
(c) $\mathrm{FeCl} _3$
(d) $\mathrm{Pb}\left(\mathrm{CH} _3 \mathrm{COO}\right) _2$
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Answer:
Correct Answer: 10. ( b )
Solution:
- Among the given salts
$\mathrm{FeCl} _3$ is acidic in nature i.e., have acidic solution as it is the salt of weak base and strong acid.
$\mathbf{A l}(\mathrm{CN}) _3$ and $\mathbf{P b}\left(\mathbf{C H} _3 \mathbf{C O O}\right) _2$ are the salts of weak acid and weak base.
$\mathrm{CH} _3 \mathrm{COOK}$ is the salt of strong base and weak acid.
Hence, the solution of $\mathrm{CH} _3 \mathrm{COOK}$ will be most basic because of the following reaction.
$CH_3COOk + H_2O \rightleftharpoons \underset{\text{Weak acid}}{CH_3COOH} + \underset{\text{Strong base}}{KOH} $
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