Chemistry
Grade-10
Easy
Question
When Cu reacts with sulphuric acid it gives a blue colour copper sulphate solution and a pungent smelling gas which turns blue litmus red. The gas is:
- Oxygen
- Hydrogen
- Sulphur trioxide
- Sulphur dioxide
Hint:
Acid turns blue litmus red.
The correct answer is: Sulphur dioxide
When Cu reacts with sulphuric acid it gives a blue colour copper sulphate, pungent smelling sulphur dioxide gas and water.
Cu + H2SO4 
CuSO4 + SO2 + H2O
Sulphur dioxide is acidic in nature, it turns blue litmus red.
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