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 -

Cu & CuO

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S &

S O_{2}

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C &

C O_{2}

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Na & NaH

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Solution

The correct option is A Cu & CuO
$2 C u + O_{2} (Δ) - - \to 2 C u O$
(x) (y)
Brown & Bright Black
$C u O + H_{2} \to C u + H_{2} O$

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