Q. 44.5( 17 Votes )

A reddish brown c A. copper and copper nitrate

B. silver and silver oxide

C. copper and copper oxide

D. aluminium and aluminium oxide

Answer :

The only reddish brown colour metal among the given options is copper. When copper powder is heated in a china dish it gets oxidized and turns black due to the formation of copper oxide (CuO). The reaction involved is:


2CuO + O2 2CuO


When H2 gas is passed over CuO, it gets reduced to Cu and thus regains its original colour.


CuO + H2 Cu + H2O

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