The gas evolved when sodium carbonate reacts with hydrochloric acid is ________.

This question was previously asked in
RRB ALP Previous Paper 6 (Held On: 13 Aug 2018 Shift 1)
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  1. Hydrogen
  2. Chlorine
  3. Hydrogen Chloride
  4. Carbon dioxide

Answer (Detailed Solution Below)

Option 4 : Carbon dioxide
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Detailed Solution

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  • Carbon dioxide gas is evolved when sodium carbonate reacts with hydrochloric acid.
  • Chemical equation

Na2CO3 + 2HCl → 2NaCl + CO2 + H2O

  • Word equation:

           Sodium carbonate + hydrochloric acid → sodium chloride + Carbon dioxide + water

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