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Chemical Properties

Choose the co...

Question

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.

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Solution

(d) Concentrated sulphuric acid is used to dry HCl gas. Drying agents such as calcium oxide (or quick lime) and phosphorus pentoxide are not used because they react with HCl.

CaO + 2HCl → CaCl₂ + H₂O

Calcium
chloride

2P₂O₅ + 3HCl → POCl₃+ 3HPO₃
Phosphorous Metaphosphoric
oxychloride acid

Hence, the correct answer is option (d).

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