Does the colour of dry litmus turn red in acidic gas ? Give reason .
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HCl is acidic only when moist or aqueous. Hydrogen Chloride gas will turn blue litmus paper red only if either the gas is moist or the litmus paper is wet with some pure water. This is because when the gas comes into contact with the water on the paper, it becomes acidic, turning the litmus paper red.
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We can say that because of the dry litmus paper it cannot react with the any acidic gas in absence of water or aqueous medium, it cannot turn the blue litmus paper red.
But if we are taking wet (moisturized) litmus paper than due to the presence of water the colour of the litmus paper will changed ...
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