A brown and bright element $X$ when heated in presence of air turns in to black substance $Y$ . If Hydrogen gas is passed over this heating material, again $X$ is obatined. $X$ and $Y$ respectively are:

C u

and

C u O

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S

and

S O_{2}

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C

and

C O_{2}

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N a

and

N a H

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Solution

The correct option is A $C u$ and $C u O$
Characteristic given the metal is Cu.
$2 C u + O_{2} Δ - \to 2 C u O$
( $X$ ) ( $Y$ )
brown and Black
bright

If hydrogen gas is passed over heated copper oxide (CuO), the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained.

$C u O + H_{2} \to C u + H_{2} O$ .

Option A is correct.

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