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      Question

      Consider the following statements: Assertion (A):

      Alcohol, instead of mercury, is used in thermometers to measure temperatures up to 60°C. Reason (R): The freezing point temperature of alcohol is lower than mercury.
      A Both (A) and (R) are true, but (R) is not the correct explanation for (A). Correct Answer Incorrect Answer
      B Both (A) and (R) are true and (R) correctly explains (A). Correct Answer Incorrect Answer
      C (A) is true, but (R) is false. Correct Answer Incorrect Answer
      D (A) is false, but (R) is true. Correct Answer Incorrect Answer

      Solution

      Mercury freezes at -39°C, whereas alcohol freezes at temperatures well below -100°C. This makes alcohol suitable for measuring very low temperatures. On the other hand, mercury boils at 357°C, while alcohol boils at 78°C, making mercury more appropriate for measuring high temperatures. Thus, both (A) and (R) are true and (R) correctly explains (A). Hence, the correct answer is (B).

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