Assertion : $Z n {(O H)}_{2}$ is dissolved in both ${N H}_{4} O H$ and $N a O H$ solution. Reason: Both $N a O H$ and ${N H}_{4} O H$ being basic can dissolve amphoteric $Z n {(O H)}_{2}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Zinc hydroxide is insoluble in water. But when excess hydroxide ions are added, water soluble zincate ion is formed.
$Z n (O H)_{2} + 2 O H^{\to} Z n (O H)_{4}^{2 -}$
These hydroxide can be supplied by NaOH as well as ammonium hydroxide ion.
Thus, $Z n (O H)_{2}$ is dissolved in both $N H_{4} O H$ and NaOH solution.
Assertion is correct but Reason is incorrect.

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Assertion :Zn(OH)2 is dissolved in both NH4OH and NaOH solution. Reason: Both NaOH and NH4OH being basic can dissolve amphoteric Zn(OH)2.

Assertion : $Z n {(O H)}_{2}$ is dissolved in both ${N H}_{4} O H$ and $N a O H$ solution. Reason: Both $N a O H$ and ${N H}_{4} O H$ being basic can dissolve amphoteric $Z n {(O H)}_{2}$ .