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Question

Consider the diagram below to identify the gas X.

Gas X is


  1. Hydrogen

  2. Oxygen

  3. Water vapour

  4. Mixture of oxygen and hydrogen


Solution

The correct option is A

Hydrogen


Calcium reacts with water to form calcium oxide with the evolution of hydrogen gas.

Ca(s) + H2O(i) → CaO(s) + H2(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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