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Question
Explain why dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water.
Explain
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Solution
A dry strip of blue litmus paper is unaffected by dry HCl gas due to the gas’s non-acidic nature. In the presence of a drop of water, HCl gas dissolves and produces hydrochloric acid, which turns blue litmus paper red.
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