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Which of the following statement is wron...

Which of the following statement is wrong for `C_((graph ite))rarr C_((diamon d))?DeltaH^(@)=+1.90kJ`

A

`DeltaH^(@)``_(f)` for`C_((graph ite))` is zero

B

`DeltaH^(@)``_(f)` for`C_((diamon d))` is `+1.90kJ`

C

The enthalpy of formation of element in a form other than its most stable one is non zero

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
The standard heat of formation in most stable state is zero.
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P BAHADUR-THERMOCHEMISTRY-Exercise 3a objective problems
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  2. The heat of atomisation of PH(3(g)) is 228kcal mol^(-1) and that of P(...

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  3. Given that : 2CO((g))+O(2(g))rarr2CO(2(g)),DeltaH^(@)=-P kJ C((s))...

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  4. For which reaction DeltaH=DeltaU ?

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  5. The enthalpy of hydrogenation of cyclohexene is -119.5kJ mol^(-1). If ...

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  6. For which of the following reactions heat of formation (Delta(f)H) is ...

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  7. For a hypothetical reaction , 3A rarr A(3) DeltaC(p) (i n J)=6.0+2.0...

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  8. In a flask, colourless N(2)O(4) is in equilibrium with brown-coloured ...

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  9. 1 mol e of ice melts at 0^(@)C and constant pressure of 1 atm by absor...

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  10. Which of the following statement is wrong for C((graph ite))rarr C((d...

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  11. 2 mol es of CO and 1 mol e of O(2) are allowed to react completely to ...

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  12. One mole of a gas is allowed to expand freely in vacuum at 27^(@)C. Th...

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  13. A system is provided 50xx10^(3)J energy and work done on the system is...

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  14. A piston exering a pressure of one atm rests on the surface of water a...

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  15. For a reaction DeltaC(p)=2.0+0.2T cal^(@)C and enthalpy of reaction at...

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  16. The latent heat of vaporisation of liquid is 10kcal mol^(-1) at 1 atm ...

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  17. One gram sample of NH(4)NO(3) is decomposed in a bomb calorimeter. The...

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  18. Bond dissociation enthalpy of H(2),Cl(2) and HCl are 434,242 and 431kJ...

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  19. The amount of heat released during the reaction of 300mL of 1M HCl wit...

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  20. The change is entropy when 1 mol e of an ideal gas is compressed to 1/...

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