When metal X reacts with dilute $HCl$ then bubbles of gas Y are formed. Moreover, when this metal X reacts with cold water it will again produce this gas Y. Identify X and Y.

X:- Calcium, Y:- Oxygen

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X:- Potassium, Y:- Oxygen

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X:- Sodium, Y:- Hydrogen

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X:- Copper, Y:- Hydrogen

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Solution

The correct option is C X:- Sodium, Y:- Hydrogen
Metals on reaction with acids, produce metal salts and hydrogen gas except copper, gold etc.

When sodium reacts with dilute $HCl$ it forms sodium chloride and hydrogen gas. The reaction involved is:

$Sodium + Hydrochloric Acid \to Sodium chloride + Hydrogen gas$

Moreover, when it reacts with the cold water it will form sodium hydroxide and hydrogen gas. The hydrogen gas formed immediately catches fire because this reaction generates a lot of heat.

$Sodium + Water \to Sodium hydroxide + Hydrogen gas$

So, X is sodium and Y is hydrogen.

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[5 Marks]

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