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Question

Name the gas evolved when potassium nitrate crystals are heated with sulphuric acid.

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Solution

The gas evolved when potassium nitrate crystals are heated with concentrated sulphuric acid is nitrogen dioxide (NO2).

H2SO4+KNO3HNO3+KHSO4
The formed nitric acid dissociates to give nitrogen dioxide, water and oxygen gas.
The equation of dissociation of nitric acid is as follows:
4HNO3O2+2H2O+4NO2

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