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Carbon and its Compounds — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceCarbon and its Compounds1 Mark
MCQ
While studying the saponification reaction, what do you observe when you mix an equal amount of colourless vegetable oil and $20\%$ aqueous solution of $\ce{NaOH}$ in a beaker?
  • A
    The colour of the mixture has become dark brown.
  • B
    A brisk effervescence is taking place in the beaker.
  • ✓
    The outer surface of the beaker has become hot.
  • D
    The outer surface of the beaker has become cold.
✓

Answer

Correct option: C.
The outer surface of the beaker has become hot.
While studying saponification reaction when equal amount of colorless vegetable oil and $20\%$ aqueous solution of $\ce{NaOH}$ in mixed in a beaker, the beaker becomes hot from outside.
This is because, $\ce{NaOH}$ reacts with the aqueous solution to release heat and an exothermic reaction takes place.
Hence option c is correct.

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