Selina Concise Chemistry Class 10 ICSE Solutions Study of Compounds – Hydrogen Chloride Selina Concise Chemistry Class 10 ICSE Solutions Study of Compounds – Hydrogen Chloride Exercise 1 1. Solution 1. 2. Solution 2. (a) Hydrogen chloride is dried by passing through conc. Sulphuric acid. (b) Phosphorous pentoxide and CaO cannot be used to dry HCl because they react with HCl. 2P2O5+ 3HCl → POCl3 + 3HPO3 CaO + 2HCl → CaCl2 + H2O 3.Explain why: (a) Anhydrous HCl is a poor conductor while aq. HCl is an excellent conductor. (b) When the stopper of a bottle full of hydrogen chloride gas is opened there are fumes in the air. (c) A solution of hydrogen chloride in water turns blue litmus red and conducts electricity , while a solution of the same gas in toluene: (i) Has no effect on litmus ,and (ii) Does not conduct electricity (d) Thick white fumes are formed when glass rod dipped in NH4OH is brought near the mouth of bottle full of HCl gas. (e) Dry hyd...
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