Chemistry
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?
- Lead nitrate
- Copper carbonate
- Sodium chloride
- Potassium sulphite
Acids Bases Salts
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Answer
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
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