Consider the diagram below to identify the gas X.

Oxygen

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Water vapour

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Hydrogen

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Mixture of oxygen and hydrogen

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Solution

The correct option is C Hydrogen
Calcium reacts with water to form calcium oxide with the evolution of hydrogen gas.

Ca_(s) + H₂O_(i) → CaO_(s) + H_2(g)

The gas evolved can be shown as hydrogen by bringing a burning candle near the mouth of the boiling tube, the gas catches fire and burns with a pop sound.

The correct answer is C.

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Consider the diagram below to identify the gas X.

Gas X is

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