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In the laboratory preparation of chlorin...

In the laboratory preparation of chlorine ,
a) Why chlorine gas is passed through the water?
b) Chlorine is collected by the upward displacement of air in the jar. Which property is behind this?

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a) Hydrogen chloride vapours coming along with chlorine is removed by passing it through water.
Chlorine gas higher density when compared to air.
c) .2KMnO_4 + 16HCl rarr 2KCl + 2MnCl_2 + 8H_2O +5Cl_2.
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