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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

Both `A`and `R` are true and `R` is the correct explantion of `A`

B

Both `A`and `R` are true and `R` is not a correct explantion of `A`

C

`A` is true but `R` is false

D

`A` is false but `R` is true

Text Solution

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The correct Answer is:
B
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DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
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  2. Assertion(A) : The mass and volume of a substance are the extensive pr...

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

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  4. Assertion(A) : For the combustion reactions, the value of DeltaH is al...

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  5. Assertion(A) : The value of enthalpy of neutralization of a weak acid ...

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  6. Statement-1 : Many endothermic reactions that are not spontaneous at r...

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  7. Assertion(A) : Helium has lower entropy than CO(2) gas which has lower...

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

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  9. Assertion(A) : Heat of vaporisation is always endothermic. Reason(R ...

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  10. Assertion(A) : Endothermic compounds are stable than the exothermic co...

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  11. Assertion(A) : q is a state function. Reason(R ) : q is a path funct...

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  12. Assertion(A) : Heat of neutralisation is always less than zero. Reas...

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  13. Assertion(A) : Absolute value of H cannot be determined. Reason(R ) ...

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  14. Assertion(A) : Heat of neutralisation of HCl and NaOH is same as that ...

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  15. Assertion (A): The dissolution of gases in water is always an endother...

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  16. Assertion(A) : The enthalpy of formation of O(2) at 1 atmospheric pres...

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  17. Assertion(A) : Two systems which are both in thermal equilibrium with ...

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  18. Assertion(A) : The value of enthalpy of neutralisation of strong acid ...

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  19. Assertion(A) : Standard entropy of O(2) gas is gt 0. Reason(R ) : En...

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  20. Assertion(A) : Decrease of free energy during the process under partic...

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