What happens when a dry blue litmus paper is introduced into a jar containing dry HCl gas?

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Solution

•When a dry blue litmus paper is introduced into a jar containing dry HCl gas then the colour of dry litmus remains the same.
•This is because acids give H+ ions only in an aqueous solution.
•Since HCl is not aqueous and the litmus paper is also not wet therefore there is no dissociation happening in this case.

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State your observation for the following cases:
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(ii) Dry red rose petals are placed in the jar of sulphur dioxide.
(iii) Paper soaked in potassium permanganate solution is introduced into a gas jar of sulphur dioxide.

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(2) Insert wet red litmus paper in a gas jar filled with SO₂ gas
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(a) dry blue litmus paper
(b) moist blue litmus paper

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