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Question

A beaker is completely filled with water at 4oC. It will overflow if

A
Heated above 4C
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B
Cooled below 4C
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C
Both heated and cooled above and below 4C, respectively
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D
None of these
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Solution

The correct option is C Both heated and cooled above and below 4C, respectively
Water has maximum density at 4C, so if the water is heated above 4C or cooled below 4C density decreases i.e., volume increases. In other words, it expands so it overflows in both the cases.
Curve between density of water and temperature.


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