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Hydrogen Chloride — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryHydrogen Chloride5 Marks
Question
Study the figure given alongside and answer the questions that follow :
Image
(i) Name the experiment illustrated here.
(ii) Identify the gas Y.
(iii) What property of gas Y demonstrated by this experiment?
(iv) Explain the observations of the experiment.
✓

Answer

(i) Fountain experiment.
(ii) The gas Y is HCl gas.
(iii) HCl gas is extremely soluble in water.
(iv) There is the formation of the fountain as water introduced from the dropper completely absorbs hydrogen chloride gas, thereby creating a very low pressure within the flask. Thus, to make up for this loss in pressure, blue litmus solution rises up the jet tube. The colour of litmus changes to red, because hydrogen chloride is an acidic gas.

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