Complete the reaction: $Z n + 2 N a O H \to$

$Z n {(O H)}_{2} + H_{2}$

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

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$Z n {(O H)}_{2} + N a_{2} O$

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

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Solution

The correct option is B
$N a_{2} Z n O_{2} + H_{2}$

(B)
Metal generally undergoes reaction with a base to form salt along with the Hydrogen molecule $(H_{2})$ .
Zinc $(Z n)$ reacts with base, Sodium hydroxide, or Caustic soda $(N a O H)$ to form Sodium zincate $(N a_{2} Z n O_{2})$ and Hydrogen molecule $(H_{2})$ . The reaction between Zinc $(Z n)$ and Sodium hydroxide or Caustic soda $(N a O H)$ is:
$Z n (s) + 2 N a O H (a q) \to N a_{2} Z n O_{2} (a q) + H_{2} (g)$

(A)
Sodium zincate $(N a_{2} Z n O_{2})$ is produced along with Hydrogen molecule instead of Zinc hydroxide $(Z n {(O H)}_{2})$ .
(C)
Sodium zincate $(N a_{2} Z n O_{2})$ is produced along with Hydrogen molecule instead of Zinc hydroxide $(Z n {(O H)}_{2})$ and Sodium oxide $(N a_{2} O)$ .
(D)
Hydrogen molecule $(H_{2})$ is produced along with Sodium zincate $(N a_{2} Z n O_{2})$ instead of Sodium oxide $(N a_{2} O)$ .
Hence, option (B) is correct. The complete reaction is $Z n (s) + 2 N a O H (a q) \to N a_{2} Z n O_{2} (a q) + H_{2} (g)$

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