Gas released in the following reaction will be:

$N a + H N O_{3} (d i l) \to$

Oxygen

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Hydrogen

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Nitrogen

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Nitrogen di oxide

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Solution

The correct option is B Hydrogen
$2 N a + 2 H N O_{3} (d i l) \to 2 N a N O_{3} + H_{2}$

The rapid chemical reaction of sodium metal with Nitric acid is a typical single displacement reaction in which a more reactive metal displaces Hydrogen from acid to form its salt and release effervescence of Hydrogen gas.
Sodium metal being more reactive than Hydrogen in reactivity series displaces Hydrogen out from Nitric acid and forms sodium nitrate salt and evolving Hydrogen gas.

Hence, the correct option is $B$

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