During an experiment, Neelam and Manish added concentrated sulphuric acid to dry (anhy-
drous) sodium chloride. A gas evolved during the reaction. When Manish placed a dry blue
litmus paper near the mouth of the test tube nothing happened but when he placed a moist
blue litmus paper, it became red. Explain why.
drous) sodium chloride. A gas evolved during the reaction. When Manish placed a dry blue
litmus paper near the mouth of the test tube nothing happened but when he placed a moist
blue litmus paper, it became red. Explain why.
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First of all the gas evolved is hydrogen chloride which is an acidic gas. secondly the litmus on wetting turns red because the water acts as a contact medium for the gas and the litmus paper.