The brown surface of copper becomes black on heating in air. When hydrogen gas is passed over this black surface, it turns (1) Brown (2) Green (3) Red (4) White
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Brown is the answer
It's because
Cu is brown in colour. It reacts with air (O2) to form CuO which is black in colour
Now H2 gas is passed over this black surface now CuO will react with H2 and form Cu + H2O(water) ..Now Cu is left so Cu is brown in colour so Brown must be the answer.
It's because
Cu is brown in colour. It reacts with air (O2) to form CuO which is black in colour
Now H2 gas is passed over this black surface now CuO will react with H2 and form Cu + H2O(water) ..Now Cu is left so Cu is brown in colour so Brown must be the answer.
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The copper turns to brown again.
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