Assertion : Al(OH)_3 is insoluble in NH_4OH b | vedclass

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(A) $Al(OH)_3$ is an amphoteric hydroxide. It is insoluble in weak bases like $NH_4OH$ but dissolves in strong bases like $NaOH$ due to the formation

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) $Al(OH)_3$ is an amphoteric hydroxide. It is insoluble in weak bases like $NH_4OH$ but dissolves in strong bases like $NaOH$ due to the formation of a soluble complex,sodium meta-aluminate $(NaAlO_2)$.The reaction is: $NaOH + Al(OH)_3 	o NaAlO_2 + 2H_2O$.Since $NaOH$ is a strong alkali,it provides a high concentration of $OH^-$ ions,which is necessary to dissolve the amphoteric $Al(OH)_3$. Thus,the Reason correctly explains the Assertion.

Assertion : $Al(OH)_3$ is insoluble in $NH_4OH$ but soluble in $NaOH$.
Reason : $NaOH$ is a strong alkali.

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Assertion : $Al(OH)_3$ is insoluble in $NH_4OH$ but soluble in $NaOH$.Reason : $NaOH$ is a strong alkali.