Question

While studying the saponification reaction, what do you observe when you mix an equal amount of colourless vegetable oil and 20% aqueous solution of NaOH in a beaker ?; A. The colour of the mixture has become dark brown; B. A brisk effervescence is taking place in the beaker; C. The outer surface of the beaker has become hot; D. The outer surface of the beaker has become cold(All India - 2017)

Answer 1

Answer:

C. The outer surface of the beaker has become hot

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Answer 2

Answer:

D. The outer surface of beaker becomes cold

Explanation:

The outer surface of the beaker becomes cold as saponification is an endothermic reaction. Hence, for a better reaction, we use a mild flame from a burner to heat the beaker. For its endothermic properties, this reaction is used in extinguishing fire.  Therefore, while studying the saponification reaction when we mix an equal amount of colourless vegetable oil and 20% aqueous solution of NaOH in beaker, we observe the outer surface of the beaker has become cold.