A brown and bright element "x" when heated in presence of air turns into black substance "y". If hydrogen gas is passed over this heating material again "x" is obtained. "x" and "y" are :
options
1
cu & cuo
2
s &
3
c &
4
na & nah
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2
Answer:
X is Cu and Y is CuO
Explanation:
The brown and bright material is Cu metal
When copper is heated in air
2Cu + O2 ---------> 2CuO
CuO is black in colour and is Y
when it's reacted with Hydrogen it reduces to Cu
CuO + H2 --------> Cu + H20
we again got X that's Cu
hope it helps you.........
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