1(vi)
When compound X reacts with dilute sulphuric acid, it releases a gas that turns acidified potassium dichromate solution from orange to green. Which of the following could be compound X?
- (a)Lead nitrate
- (b)Copper carbonate
- (c)Sodium chloride
- (d)Potassium sulphite
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Potassium sulphite
Reason — Potassium sulphite reacts with dilute sulphuric acid, to release sulphur dioxide. SO2 is a reducing gas, that turns acidified potassium dichromate solution from orange to green.
K2SO3 + H2SO4 ⟶ SO2 ↑ + H2O + K2SO4