Chemistry
Grade-10
Easy
Question
A solution reacts with marble chips to produce a gas which turns lime water milky. The solution contains:
- Calcium sulphate
- Potassium sulphate
- Sodium sulphate
- Sulphuric acid
Hint:
Marble chips react with sulphuric acid.
The correct answer is: Sulphuric acid
Marble chips are metamorphic rocks formed by the alteration of limestone by heat and pressure. In its pure form, marble is a white stone with a crystalline and sugary appearance, consisting of calcium carbonate CaCO3.
When a solution reacts with marble chips to produce a gas which turns lime water milky. The gas that makes the lime water milky is carbon dioxide and the solution is sulphuric acid.
CaCO3 + H2SO4 
CaSO4 + CO2 + H2O
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