Which of the following metals on reacting with sodium hydroxide solution produce hydrogen gas?
A. Cu B. Al
C. Fe D. Zn

B and C

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A and D

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B and D

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B only

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Solution

The correct option is C B and D
Al and Zn (amphoteric in nature) on reaction with sodium hydroxide solution produce hydrogen.
$2 N a O H + Z n \to N a_{2} Z n O_{2} + H_{2}$
$2 N a O H + 2 A l + 2 H_{2} O \to 2 N a A l O_{2} + 3 H_{2}$

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