Assertion :Enthalpy of graphite is lower than that of diamond. Reason: Entropy of graphite is lower than that of diamond.

Read the above assertion and reason and choose the correct option regarding it.

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
Carbon in graphite is $s p^{2}$ hybridized i.e. has 33% $s$ character, Thus the $C - C$ bond is more strong in graphite than in diamond, i.e. during combustion less heat is released from graphite and hence enthalpy of graphite is lower.
Diamond is crystalline solid which is highly ordered structure while such arrangements are not found in the graphite. So, the degree of disorder is less in diamond. Hence, an entropy of the diamond is lesser than graphite.

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Similar questions

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.

(a) Assertion and Reason both are correct statements an Reason is correct explanation for Assertion.

(b) Assertion and Reason both are correct satements but Reason is not correct explanation for Assertion.

(d) Assertion is wrong statement but Reason is correct statement.

Assertion (A) Graphite is a good conductor of electricity however diamond belongs to the category of insulators.

Reason (R) Graphite is soft in nature on the other hand diamond is very hard and brittle.

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
Assertion: Ionisation enthalpies for early actinoids are lower than that for early lanthanoids.
Reason: 5f electrons more effectively shielded from the nuclear charge than the 4f electrons
of the corresponding lanthanoids.

Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

Assertion: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis.

Reason: Equation of the x – axis is y = 0
Now, choose the correct option.

Q. Assertion: The compressibility factor for

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Reason: The compressibility factor for

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Assertion :Enthalpy of graphite is lower than that of diamond. Reason: Entropy of graphite is lower than that of diamond.Read the above assertion and reason and choose the correct option regarding it.

Assertion :Enthalpy of graphite is lower than that of diamond. Reason: Entropy of graphite is lower than that of diamond.

Read the above assertion and reason and choose the correct option regarding it.