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Assertion (A): The enthalpy of both gra...

Assertion (A): The enthalpy of both graphite and diamond is taken to be zero, being elementary substances
Reason (R ) : The enthalpy of formation of an elementary substance in any state is taken as zero.

A

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

B

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

C

If (A) is true but (R) is false

D

If both (A) and (R) are false.

Text Solution

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The correct Answer is:
D
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OP TANDON-Chemical Thermodynamics and Thermochemistry-Assertion Reason Type Question
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  3. Assertion (A): May endothermic reactions that are not spontaneous at ...

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

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

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

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  7. Statement -1: heat of neutralistion of perchoric acid ,HClO(4) with Na...

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

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

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

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

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

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

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

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

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

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  17. Assertion: Molar entropy of vaporization of water is different from et...

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

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  19. Statement -1 in the following reaction : C(s)+O(2)(g)to CO(2) (g), D...

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  20. (A) For reaction ltBrgt 2NH(3)(g)toN(2)(g)+3H(2)(g)," "DeltaHgtDelta...

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