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Assertion (A): Enthalpy of graphite is l...

Assertion (A): Enthalpy of graphite is lower than that of diamond.
Reason (R ) : Entropy of graphite is lower than that of diamond.

A

If both (A) and (R ) are correct, and (R ) is the correct explanation for (A).

B

If the both (A) and (R ) are correct, but(R ) is not a correct explanation for (A).

C

If (A) is correct, but (R ) is incorrect.

D

If (A) is incorrect, but (R ) is correct.

Text Solution

Verified by Experts

Graphite is most stable of carbon, hence its energy is lower than that of diamond and entropy of graphite is also lower than that of diamond.
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CENGAGE CHEMISTRY-THERMODYNAMICS-Exercises (Assertion-Reasoning)
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  2. Assertion (A): The Joules -Thomon coefficient for an ideal gas is zer...

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  3. Assertion (A): Enthalpy of graphite is lower than that of diamond. R...

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  4. Assertion: The enthalpy of formation of gaseous oxygen molecules at 29...

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  5. Assertion (A): Heat of neutralisation for both HNO(3) and HCI with NaO...

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  6. Assertion (A): Decrease in free energy causes spontaneous reaction ...

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  7. Assertion (A): May endothermic reactions that are not spontaneous at ...

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  8. Assertion (A): The enthalpy of formation of H(2)O(l) is greater than t...

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  9. Assertion (A): For a particular reaction, heat of combustion at consta...

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  10. Assertion (A): The enthalpy of both graphite and diamond is taken to ...

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  11. Assertion (A): The heat of neutralisation of perchloric acid, HCIO(4),...

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  12. Assertion (A): The Heat of ionisation of water is equal to the heat o...

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  13. Assertion (A): The enthalpy of formation of HCI is equal to the bond e...

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  14. Assertion (A): Pressure, volume, and temperature are all extensive pro...

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  15. Assertion (A): When a gas at high pressure expands against vacuum, th...

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  16. Assertion: When a real gas is allowed to expand adiabatically through ...

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  17. Assertion (A): Internal energy change in a cyclic process is zero. ...

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  18. Assertion (A): An exothermic process, non-spontaneous at high temperat...

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  19. Assertion (A): There is no reaction known for which DeltaG is positive...

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  20. Assertion (A): A reaction which is spontaneous and accompained by decr...

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