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The diagram shows an experimental set up...

The diagram shows an experimental set up for the laboratory preparation of a pungent smelling gas. The gas is alkaline in nature.

How will you find that the jar is full of gas?

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By bringing a wet red litmus paper near the brim (mouth) of the gas jar. When jar is full of gas, litmus will turn blue.
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ICSE-CHEMISTRY 2011-SECTION-II
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  2. The diagram shows an experimental set up for the laboratory preparatio...

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  3. The diagram shows an experimental set up for the laboratory preparatio...

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  9. In the laboratory preparation of hydrochloric acid, HCl gas is dissolv...

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