Question

dry hydrogen chloride gas does not turn blue Litmus to Red .Explain.

Answer 1

For indicating whether the substance is acidic or basic we need to make it moist or make the litmus paper moist.

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Answer 2

The colour of litmus paper changes only in the presence of ions like hydrogen (H+) or hydronium (H3O+) ions. HCl can produce these ions only in the form of aqueous solution. Hence dry HCl gas does not change the colour of dry litmus paper.

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