When the powder of a common metal is heated

Asked by admin @ in Chemistry viewed by 224 People

When the powder of a common metal is heated in an open china dish its colour changes to black . However when hydrogen is passed over the hot black substance so formed, it regains its original colour . Based on the above information answer the following questions..

1 what type of chemical reactions takes place in each of the two given steps ?
2,name the metal initially taken in the powder form . Write balanced chemical equations for both reactions.

Answered by admin @


Metal initially taken is Cu
2Cu+O2---->2CuO (black)

when hydrogen is passed over CuO it regains its original color
CuO+H2 ----->Cu+H2O

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