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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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