The S-block Elements Chemistry NCERT Exemplar Solutions Class 12th Chapter Ten Class 12th Chemistry

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives:

Option 1 - <p>Zn(OH)<sub>2</sub></p>

Option 2 - <p>ZnO</p>

Option 3 - <p><span class="mathml" contenteditable="false"> <math> <mrow> <msup> <mrow> <mrow> <mo>[</mo> <mrow> <mi>Z</mi> <mi>n</mi> <msub> <mrow> <mrow> <mo>(</mo> <mrow> <mi>O</mi> <mi>H</mi> </mrow> <mo>)</mo> </mrow> </mrow> <mrow> <mn>4</mn> </mrow> </msub> </mrow> <mo>]</mo> </mrow> </mrow> <mrow> <mn>2</mn> <mo>−</mo> </mrow> </msup> </mrow> </math> </span></p>

Option 4 - <p><span class="mathml" contenteditable="false"> <math> <mrow> <msup> <mrow> <mrow> <mo>[</mo> <mrow> <mi>Z</mi> <mi>n</mi> <msub> <mrow> <mi>O</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msub> </mrow> <mo>]</mo> </mrow> </mrow> <mrow> <mn>2</mn> <mo>−</mo> </mrow> </msup> </mrow> </math> </span></p>

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Answered by

Vishal Baghel | Contributor-Level 10

6 months ago

Correct Option - 4

Detailed Solution:

Following is the reaction of Zn with excess alkali,

$Z n + 2 N a O H + 2 H_{2} O \to N a_{2} {[Z n (O H)]}_{4} + H_{2}$

$N a_{2} Z n O_{2} + 2 H_{2} O$

$2 N a^{+} Z n O_{2}^{- -}$

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Ten 2025

Chemistry NCERT Exemplar Solutions Class 12th Chapter Ten 2025

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