Calcium oxide and phosphorus pentoxide are very good drying agents but they are not used to dry HCl gas. Give reasons for each.

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Solution

Although calcium oxide and phosphorus pentoxide are very good drying agents, they cannot be used to dry HCl gas because they react with it.

2P₂O₅(s) + 3HCl (aq) → POCl₃(aq) + 3HPO₃(aq)
CaO(s) + 2HCl (aq) → CaCl₂(aq) + H₂O (l)

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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.

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?

Q. (i) How is ammonia gas prepared in laboratory starting from NH₄Cl? State the conditions and balanced equation for the preparation.
(ii) How is gas collected in a gas jar?
(iii) Name the substance used for drying ammonia gas. Why cannot substances such as conc. H₂SO₄, anhydrous calcium chloride and phosphorus pentoxide be used for drying ammonia gas?

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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Calcium oxide and phosphorus pentoxide are very good drying agents but they are not used to dry HCl gas. Give reasons for each.

Although calcium oxide and phosphorus pentoxide are very good drying agents, they cannot be used to dry HCl gas because they react with it. 2P2O5 (s) + 3HCl (aq) → POCl3 (aq) + 3HPO3 (aq) CaO(s) + 2HCl (aq) → CaCl2 (aq) + H2O (l)

Although calcium oxide and phosphorus pentoxide are very good drying agents, they cannot be used to dry HCl gas because they react with it.

2P₂O₅(s) + 3HCl (aq) → POCl₃(aq) + 3HPO₃(aq)
CaO(s) + 2HCl (aq) → CaCl₂(aq) + H₂O (l)