A shiny brown metal X when exposed to the atmosphere undergoes corrosion and develops a greenish layer Y on its surface. Identify X and Y.

X: Copper
Y: Copper sulphate

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X: Copper
Y: Copper carbonate

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X: Iron
Y: Iron oxide

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X: Iron
Y: Iron hydroxide

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Solution

The correct option is B X: Copper
Y: Copper carbonate
From the given options, only copper is a shiny brown metal. When exposed, it reacts with carbon dioxide, oxygen and moisture present in atmosphere and forms a greenish coating of basic copper carbonate.
This is called tarnishing of copper.

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When copper is exposed to moist air for a long time then a layer deposits on its surface due to corrosion. The colour of this layer is:

\begin{matrix} Column I & Column II W & No layer X & Greenish layer Y & Black layer Z & Reddish-brown layer \end{matrix}

O_{2}

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