When ammonia is passed over heated copper oxide, the metallic copper is obtained, the reaction shows that ammonia is ____ ?

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a dehydrating agent

an oxidising agent

a reducing agent

a nitrating agent

answer is C.

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Detailed Solution

In the reaction, the oxidation state of Cu is changed from +2 to 0. Therefore, ammonia is acting as reducing agent. Ammonia acts as RA with chlorine, bleaching powder, hypochlorite, Copper (II) oxide and lead(II) oxide and gets oxidised to nitrogen.NH3+CuO→Cu+N2+H2O

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