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ICSE Class 9 Chemistry Question 21 of 24

Model Question Paper — 2 — Question 21

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21
Question

Question 8(a)

How is the lightest gas collected and dried during its laboratory preparation?

Answer

The lightest gas, hydrogen is collected by downward displacement of water.

To dry the gas common drying agents like fused calcium chloride, caustic potash stick and phosphorus pentoxide can be used.

After purifying and drying, the gas is collected over mercury because mercury has no reaction with it.