When a black metal compound XO is heated with a colourless gas $Y_{2}$ , the metal X and another compound $Y_{2} O$ are formed. Metal X is red- brown in colour which does not react with dilute acids at all. Gas $Y_{2}$ can be prepared by the action of a dilute acid on any active metal. The compound $Y_{2} O$ is a liquid at room temperature which can turn anhydrous copper sulphate blue. The metal X is

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Aluminium

Zinc

Copper

Magnesium

answer is A.

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Detailed Solution

The metal X is copper.
Metal X does not react with any dilute acid because X must be less reactive than hydrogen. As metal X is red- brown in colour, it is most probably copper. Copper is less reactive than hydrogen and it is placed lower to it in the reactivity series.
The reaction involved is: