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Draw a labelled diagram to show the preparation of hydrogen chloride gas in laboratory. (ii) Test the gas evolved first with dry and then with

Draw a labelled diagram to show the preparation of hydrogen chloride gas in laboratory.
(ii) Test the gas evolved first with dry and then with wet litmus paper. In which of the two cases, does the litmus paper show change in colour?
(iii) State the reason of exhibiting acidic character by dry HCl gas/HCl solution.

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