When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
(a) absorb the evolved gas
(b) moisten the gas
(c) absorb moisture from the gas
(d) absorb Cl– ions from the evolved gas
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During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing anhydrous calcium chloride. The role of anhydrous calcium chloride taken in the guard tube is to. Solution : Anyhdrous CaCl2 absorbs moistture to keep the gas in dry state.
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On a humid day,
H2+Cl2CaCl22HCl
Calcium chloride is used as an absorbent in the guard tube while hydrogen chloride is being formed on a humid day as it can absorb the moisture present in the air. HCl corrosively reacts with water leading to the formation of hydrochloric acid as it is strongly acidic in nature. It gives out white fumes on reacting with moisture.
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