When heated $N H_{3}$ is passed over $C u O$ , evolved gas is :

N_{2}

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N_{2} O

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H N O_{3}

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N O_{2}

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Solution

The correct option is A $N_{2}$

When ammonia is heated and passed over solid copper(II)oxide at high temperatures, nitrogen gas is formed.

$2 N H_{3} (g) + 3 C u O (s) \to N_{2} (g) + 3 C u (s) + 3 H_{2} O (g)$
Hence option A is correct.

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