You enter a laboratory after a class has completed the Fountain experiment. How will you be able to tell whether the gas used in experiment was hydrogen chloride or ammonia?

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Solution

If the solution in the round-bottom flask is blue, the gas in the flask will be ammonia because ammonia in solution form is a base and it turns red litmus solution blue. On the other hand, the presence of hydrogen chloride gas in the round-bottom flask will leave a red-coloured solution in the flask because hydrogen chloride solution is acidic in nature and it turns blue litmus solution red.

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