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Question
The gas formed when calcium bisulphite reacts with dilute NHO3.
Options
Sulphur trioxide
Hydrogen
Sulphur dioxide
Hydrogen sulphide
MCQ
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Solution
Sulphur dioxide
Explanation:
When any bisulphite (or sulphite) salt reacts with a dilute acid, it undergoes a decomposition reaction to liberate sulphur dioxide (SO2) gas.
\[\ce{Ca(HSO3)2 + 2HNO3 -> Ca(NO3)2 + 2H2O + 2SO2 ^}\]
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