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प्रश्न
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?
विकल्प
Lead nitrate
Copper carbonate
Sodium chloride
Potassium sulphite
MCQ
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उत्तर
Potassium sulphite
Explanation:
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.
\[\ce{K2SO3 + H2SO4 -> SO2 ^ + H2O + K2SO4}\]
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