Multiple Choice Questions on A liquid initially contracts when cooled to 4 C but on further cooling down to 0 C it expands The nb........... for General Studies (Level 1) Preparation

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Multiple Choice Questions

A liquid initially contracts when cooled to 4 C but on further cooling down to 0 C it expands The nb...........

General Science (Easy) Physics
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    A liquid initially contracts when cooled to 4 C but on further cooling down to 0 C, it expands. The  liquid is:

    Alcohol

    Incorrect Answer

    Water

    Correct Answer

    Mol tern iron

    Incorrect Answer

    Mercury

    Incorrect Answer
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    Explanation:

    Water

    When liquid water is cooled, it contracts until a temperature of approximately 4 oC is reached. After that, it expands slightly until it reaches the freezing point.


    Reason
    The distance between the H−O bond is more than the O−O bond in the water. Hence, the water freezing over into ice is held together not by the O−O attraction but by the H−O attraction.

    Hence, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
     
    The density of water is maximum at 4 oC.

     The density of water decreases when you cool it from 4 oC to 0 oC.

    By: Pradeep Kumar
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