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Question

Question 27.
Which of the following is/are true when HCl(g) is passed through water?
(i) It does not ionise in the solution as it is a covalent compound.
(ii) It ionises in the solution.
(iii) It gives both hydrogen and hydroxyl ion in the solution.
(iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.

(a) (i) only
(b) (iii) only
(c) (ii) and (iv)
(d) (iii) and (iv)

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Solution

When HCl is passed through water then being a polar covalent compound it ionises as:

HCl (aq)H++Cl

It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule. The reaction takes place as follows:

H++H2OH3O+

Hence, option (c) is correct.

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