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Explanation:
The colour of blue litmus paper changes only in the presence of ions like hydrogen (H
+
) or hydronium (H
3
O
+
) ions. HCl can produce these ions only when in the form of an aqueous solution.
Hence dry HCl gas does not change the colour of dry litmus paper.
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Sodium carbonate-put a few drops of phenolphthalein in the sodium carbonate.The indicator will turn pink
Hydrochloric acid-colour of hydrochloric acid does not change on adding of phenolphthalein
sodium chloride-when it is reacted with phenolphthalein,the solution remains colourless
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