A shiny brown coloured element $X$ , when heated in the air, forms a black coloured compound $Y$ . Identify $X$ and $Y$ .

X:- Sodium,;Y:- Sodium oxide

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X:- Copper, Y:- Copper dioxide

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X:- Copper, Y:- Copper oxide

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X:- Sodium, Y:- Sodium dioxide

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Solution

The correct option is C X:- Copper, Y:- Copper oxide
Shiny brown coloured element $X$ is copper which when heated in the presence of oxygen forms black coloured compound $CuO$ . Hence $Y$ is copper oxide, $CuO$ .
$2 Cu(s) + O_{2} (g) \to 2 CuO(s)$

Whereas sodium is a shiny silver element that reacts vigorously with air to form sodium oxide which is white in colour. This reaction generates a lot of heat and light.

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