Hydrogen chloride gas can be subjected to drying only with concentrated H2SO4 but not with quick lime or phosphorous pentaoxide . Explain.

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Solution

Quicklime and Phosphorus pentoxide are generally not used to dry hydrogen chloride gas as they can react with HCl according to the following equations:
CaO + 2 HCl â†’ CaCl₂ + H₂O
P₂O₅ + 3 HCl â†’ POCl₃ + H₃PO₄

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Choose the correct answer from the options given below:
(i) Hydrogen chloride gas being highly soluble in water is dried by:
(a) Anhydrous calcium chloride
(b) Phosphorous penta oxide
(c) Quick lime
(d) Concentrated sulphuric acid.

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

Q. Assertion :Hydrogen chloride gas can be dried over quick lime. Reason: HCl is less reactive and it reacts with calcium oxide to form calcium oxychloride and does not absorb water in the reaction.

Explain, why (or give reasons for)
(i) In the laboratory preparation of hydrogen chloride from sodium chloride, the gas can be obtained below 200°C or above. But the lower temperature is preferred.
(ii) Hydrogen chloride is not collected over water.
(iii) Hydrochloric acid cannot be concentrated above 22.2% by boiling.
(iv) HCl gas does not conduct electricity, but hydrochloric acid conducts electricity.
(v) Only a very dilute solution of hydrogen chloride in water can be concentrated by boiling the solution while a very concentrated solution would become less concentrated when boiled.
(vi) When the stopper of a bottle full of HCl gas is opened there are fumes in the air.
(vii) A solution of HCl gas in water turns blue litmus red and conducts electricity, while HCl gas dissolves in toluene and it has no effect on litmus and does not conduct electricity.
(viii) An aqueous solution of chlorine is acidic in nature.

In the laboratory preparation of $H C l$ gas, the drying agent used conventionally (conc. $H_{2} S O_{4}$ ) can be replaced by quicklime & phosphorous pentoxide.

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Hydrogen chloride gas can be subjected to drying only with concentrated H2SO4 but not with quick lime or phosphorous pentaoxide . Explain.

Quicklime and Phosphorus pentoxide are generally not used to dry hydrogen chloride gas as they can react with HCl according to the following equations:CaO + 2 HCl â†’ CaCl2 + H2OP2O5 + 3 HCl â†’ POCl3 + H3PO4

Quicklime and Phosphorus pentoxide are generally not used to dry hydrogen chloride gas as they can react with HCl according to the following equations:
CaO + 2 HCl â†’ CaCl₂ + H₂O
P₂O₅ + 3 HCl â†’ POCl₃ + H₃PO₄