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Standard XII

Physics

Anomalous Expansion of Water

Assertion :Th...

Question

Assertion :The density of water remains constant as it is cooled from room temperature until its temperature reaches $4^{o} C$ Reason: Below $4^{o} C$ ,the density increases.

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 D Both Assertion and Reason are incorrect
The volume of water decreases when water is cooled from room temperature,until its temperature reaches $4^{o} C$ and hence density increases. Below $4^{o} C$ , the volume increases and therefore the density decreases.

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Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion :The density of water remains constant as it is cooled from room temperature until its temperature reaches 4oC Reason: Below 4oC,the density increases.

The correct option is D Both Assertion and Reason are incorrectThe volume of water decreases when water is cooled from room temperature,until its temperature reaches 4oC and hence density increases. Below 4oC, the volume increases and therefore the density decreases.

Assertion :The density of water remains constant as it is cooled from room temperature until its temperature reaches $4^{o} C$ Reason: Below $4^{o} C$ ,the density increases.

The correct option is D Both Assertion and Reason are incorrect
The volume of water decreases when water is cooled from room temperature,until its temperature reaches $4^{o} C$ and hence density increases. Below $4^{o} C$ , the volume increases and therefore the density decreases.