Assertion :Aluminium and zinc metal evolve $H_{2}$ gas from NaOH solution. Reason: Several non-metals such as P, S, Cl, etc. yield a hydride instead of $H_{2}$ gas from NaOH.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Aluminium and zinc metal evolve $H_{2}$ gas from NaOH solution.
$2 A l + 2 N a O H + 2 H_{2} O \to 2 N a A l O_{2} (sodium aluminate) + 3 H_{2} Z n + 2 N a O H \to N a_{2} Z n O_{2} (sodium zincate) + H_{2}$
Several non-metals such as P, S, Cl, etc. yield a hydride instead of $H_{2}$ gas from NaOH.
$P_{4} + 3 N a O H + 3 H_{2} O \to 3 N a H_{2} P O_{2} + P H_{3} ↑ 4 S + 6 N a O H \to N a_{2} S_{2} O_{3} + 2 N a_{2} S + H_{2} O C l_{2} + 2 N a O H (c o l d) \to n a C l + N a C l O + H_{2} O 3 C l_{2} + 6 N a O H (h o t) \to 5 N a C l + N a C l O_{3} + 3 H_{2} O$
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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