Chemistry, asked by gunjans8039, 1 year ago

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

Answers

Answered by starock20kamalrock
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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