Assertion :Standard heat enthalpy of a compound is its heat of formation at $25^{o} C$ and $1$ atm. Reason: Standard heat ethalpy of pure elements have arbitrarily assumed to be zero.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Solution:
Standard heat enthalpy of of a compound is same as the heat of formation at $25^{o} C$ and 1 atm because we take the standard heat enthalpy of pure substance as zero.
Hence, the correct option is A.

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Assertion :Standard heat enthalpy of a compound is its heat of formation at 25oC and 1 atm. Reason: Standard heat ethalpy of pure elements have arbitrarily assumed to be zero.

Assertion :Standard heat enthalpy of a compound is its heat of formation at $25^{o} C$ and $1$ atm. Reason: Standard heat ethalpy of pure elements have arbitrarily assumed to be zero.