Extraction of Metals - Result Question 50
Assertion and Reason
Read the following questions and answer as per the direction given below:
(a) Statement I is correct; Statement II is correct; Statement II is the correct explanation of Statement I.
(b) Statement I is correct; Statement II is correct; Statement II is not the correct explanation of Statement I.
(c) Statement I is correct; Statement II is incorrect.
(d) Statement I is incorrect; Statement II is true.
50.
Statement I: $Al(OH) _3$ is amphoteric in nature.
Statement II: $Al-O$ and $O-H$ bonds can be broken with equal ease in $Al(OH) _3$.
(1998)
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Answer:
Correct Answer: 50. (b)
Solution:
- $Al(OH) _3$ is amphoteric
$ \begin{gathered} \underset{\text { Base }}{\mathrm{Al}(\mathrm{OH})_3}+3 \mathrm{HCl} \longrightarrow \mathrm{AlCl}_3+3 \mathrm{H}_2 \mathrm{O} \\ \underset{\text { Acid }}{\mathrm{Al}(\mathrm{OH})_3}+\mathrm{NaOH} \longrightarrow \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_4\right] \end{gathered} $
High charge and small size of $Al^{3+}$ makes $Al-O$ and $O-H$ bonds equally ionisable.
BETA
