12. How will you obtain dry oxygen in the laboratory

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Solution

Dry Oxygen (O₂) :- Dry oxygen(O₂) is heavier than moist O₂ since the vapour density of dry O₂ is more than moist O₂.
Dryness is measured on the basis of moisture. The lesser the moisture content the drier it will be.
Dry oxygen in the laboratory
If oxygen gas is passed through a tower containing some drying agents like phosphorous pentoxide (P₂O₅) ,fused calcium chloride through concentrated sulphuric acid (H₂SO₄).
These dry agents absorb moisture from the gas and make it dry.

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