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Question:

A student puts a drop of the reaction mixture of a saponification reaction first on a blue litmus paper and then on a red litmus paper. He may observe that:

there is no change in the blue litmus paper and the red litmus paper turns white

there is no change in the blue litmus paper and the red litmus paper turns blue

there is no change in the red litmus paper and the blue litmus paper turns red

no change in colour is observed in both the litmus papers

Solution:

Saponification is the alkaline hydrolysis of the fatty acid esters. Hence the solution is basic. Bases with blue litmus give no color change. On dipping red litmus paper in a mixture of saponification reaction it turns blue. Option C is correct.