The drying agents like P-2 O-5 and CaO cannot be used to dry hydrogen chloride gas because-P2O5 is volatile-CaO is not a drying agent-Both P2O5 and CaO react with hydrogen chloride-P2O5 is not a drying agent-

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Laboratory Preparation of Ammonia

The drying ag...

Question

The drying agents like $P_{2} O_{5}$ and CaO cannot be used to dry hydrogen chloride gas because:

P₂O₅ is volatile

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CaO is not a drying agent

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Both P₂O₅ and CaO react with hydrogen chloride

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P₂O₅ is not a drying agent

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Solution

The correct option is C
Both P₂O₅ and CaO react with hydrogen chloride

Hydrogen chloride gas is dried by passing through conc. sulphuric acid. The other drying agents like phosphorous pentaoxide and quick lime cannot be used since they react with hydrogen chloride.

$2 P_{2} O_{5} + 3 H C l \to P O C l_{3} + 3 H P O_{3} C a O + 2 H C l \to C a C l_{2} + H_{2} O$

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Q. Drying agents like calcium oxide and phosphorus pentoxide are not used for drying hydrogen chloride gas. Give reasons for each. [3 marks]

Q. Drying agents like calcium oxide and phosphorus pentoxide are not used for drying hydrogen chloride gas. Give reasons for each. [2 MARKS]

(a) Draw a labelled diagram for the laboratory preparation of hydrogen chloride gas.
(b) Give the balanced equation for the reaction.
(c) Name the drying agent used in drying hydrogen chloride gas.
(d) Phosphorus pentoxide and calcium oxide are good drying agents but they cannot be used to dry hydrogen chloride gas. Why?

Which of the following drying agent is used in drying hydrogen chloride gas?

Q. Assertion :