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

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

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

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no change in colour is observed in both the litmus papers

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Solution

The correct option is C there is no change in the blue litmus paper and the red litmus paper turns blue
Saponification is the alkaline hydrolysis of the fatty acid esters.
Hence the solution is basic, bases with blue litmus gives no colour change.
On dipping red litmus paper in a mixture of saponification reaction it turns blue.
Option C is correct.

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Similar questions

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

(a) There is no change in the blue litmus paper and the red litmus paper turns white.

(b) There is no change in the red litmus paper and the blue litmus paper turns red.

(c) There is no change in the blue litmus paper and the red litmus paper turns blue.

(d) No change in colour is observed in both the litmus papers.

Q. What do we observe on pouring acetic acid on red blue litmus papers ?
(a) Red litmus remains red and blue litmus turns red.
(b) Red litmus turns blue and blue litmus remains blue.
(c) Red litmus turns blue and blue litmus turns red.
(d) Red litmus becomes colourless and blue litmus remains blue.

Q. Dry ammonia has no action on litmus paper, but a solution of ammonia in water turns red litmus paper blue. Why?

When a red litmus paper is dipped in the aqueous solution of $X$ there is no change in colour.
When a blue litmus paper is dipped in the same solution it turns red.
Which among the following options can be the chemical $X$ ?

Q. Read the following statements:
I. When a red litmus paper is dipped into reaction mixture of a saponification reaction, it turns blue and the reaction is exothermic.
II. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is exothermic.
III. When a red litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.
IV. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.
Which of the above statements are correct?

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