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Reaction of Acids and Bases with Metals

2NaOHaq + Zns...

Question

$2 N a O H (a q) + Z n (s) \to$

N a_{2} Z n O_{2} + H_{2} (g)

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N a_{2} Z n O_{2} + H_{2} O (l)

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2 N a_{2} Z n O_{2} + H_{2} (g)

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N a_{2} O_{2} + H_{2} (g)

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Solution

The correct option is A $N a_{2} Z n O_{2} + H_{2} (g)$
$Z n$ is not acidic nor basic. It is amphoteric. All amphoteric salts behave in the following way.

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

Zinc reacts with sodium hydroxide to produce zincate sodium and hydrogen.

Hence, the correct option is $A$

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Δ H_{1}

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Δ H_{2}

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