Assertion :Latent heat of fusion of ice is $336000 J k g^{- 1}$ . Reason: Latent heat refers to change of state without any change in temperature.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion
The Latent heat of fusion of ice is amount of heat required to convert unit mass of ice at $0^{o} C$ into water $0^{o} C$ . For fusion of ice.
$L = 80 c a l g^{- 1} = 80000 c a l k g^{- 1}$
$= 80000 \times 4.2 J k g^{- 1}$
$= 336000 J k g^{- 1}$
Hence both Assertion and Reason are correct but reason is not correct explanation of assertion.

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