Which of the following pairs of substances will not produce hydrogen when reacted together?

Copper and conc. nitric acid

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Ethanol and metallic sodium

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Magnesium and steam

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Phenol and metallic sodium

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Solution

The correct option is A Copper and conc. nitric acid
$a) C u + 4 H N O_{3} (c o n c .) \to C u (N O_{3})_{2} + 2 N O_{2} + 2 H_{2} O$

$b) C_{2} H_{5} O H + N a \to C_{2} H_{5} O^{-} N a^{+} + \frac{1}{2} H_{2} ↑$

$c) M g + 2 H_{2} O (s t e a m) \to M g (O H)_{2} + H_{2} ↑$

$d) C_{6} H_{5} O H + N a \to C_{6} H_{5} O^{-} N a^{+} + \frac{1}{2} H_{2} ↑$

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