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प्रश्न
Give reasons:
When ammonia gas is passed over black copper oxide in a combustion tube, a reddish-brown substance is left behind.
कारण सांगा
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उत्तर
When ammonia gas is passed over black copper oxide in a combustion tube, a reddish-brown substance is left behind because ammonia gas reduces black copper [II] oxide to brown Copper.
\[\ce{2NH3 + 3CuO -> 3Cu + 3H2O + N2 ^}\]
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