Assertion :A glass of water is filled at $4^{\circ} C .$ Water will overflow, if temperature is increased or decreased. (Ignore expansion of glass). Reason: Density of water is minimum at $4^{\circ} C .$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Reason is incorrect.
Water has highest density at $4^{\circ} C$ temperature. This is the reason for water at the bottom of the lake being at the given temperature.
Hence when water is filled in glass of water at this temperature, it occupies minimum volume for a given amount. When temperature is changed, density decreases, volume of water for the same amount increases and thus water overflows.

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Assertion :A glass of water is filled at 4∘C. Water will overflow, if temperature is increased or decreased. (Ignore expansion of glass). Reason: Density of water is minimum at 4∘C.

Assertion :A glass of water is filled at $4^{\circ} C .$ Water will overflow, if temperature is increased or decreased. (Ignore expansion of glass). Reason: Density of water is minimum at $4^{\circ} C .$