Sonali was performing a experiment in which metal X which was of reddish brown colour, when heated in the presence of oxygen it forms a black coloured compound Y which was basic in nature. When this is again heated in the presence of hydrogen gas it gives back the substance X. Identify the X and Y?

X and y are Ca and Ca(OH)₂respectively

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X and y are Mg and Mg(OH)₂respectively

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X and y are Cu and CuO respectively

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None of these.

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Solution

The correct option is C X and y are Cu and CuO respectively
Oxygen reacts with copper to form copper oxides which has black colour.
$2 C u (s) + O_{2} (g) \to 2 C u O (s) (A i r) B l a c k C u O + H_{2} (g) \to C u + H_{2} O$
The copper (II) oxide is losing oxygen and is being reduced. The hydrogen is gaining oxygen and is being oxidized.
Here, X and are Cu and CuO respectively.

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