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Salt + H2SO4 → Coloured vapours which turns starch iodide paper blue. Identify the acid radical and the coloured vapours giving the relevent chemical equations.

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2NO2 + H2SO4 → SO42– + 2HNO

3HNO2 → HNO3 + 2NO + O2 

2NO+ O → 2NO2 ↑ (Reddish brown) 

2KI + 2NO2 → 2KNO2 + I

Starch + I2 → blue

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