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A number of small drops of mercury coalesce adiabatically to form a single drop. The temperature of drop

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Decreases

Increases

Remains unchanged

May decreases or increase depending upon size

answer is B.

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Detailed Solution

When several mercury drops are adiabatically coalesced, the larger drop's overall surface area will decrease, meaning that the smaller drops will have more potential energy than the larger drop because they have a larger surface area.

This potential energy difference will be used to raise the temperature of the larger drop. Hence, the temperature increases.

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