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Question

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 the water molecule.

A
I only
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B
III only
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C
II and IV
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D
III and IV
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Solution

The correct option is D II and IV
HCl is strong acid and ionises in the solution into H+ and OH. H+ forms H3O+ (hydronium ion) in water.

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