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Which of the following is incorrect abou...

Which of the following is incorrect about the reaction `:`
`underset((Diamon d))(C+O_(2(g))rarr CO_(2(g)), DeltaH=-94.3kcal` at `25^(@)C` and `1 atm` ?

A

Heat of combustion of `C=-94.3kcal`

B

Heat of formation of `CO_(2)=-94.3kcal`

C

`DeltaH=DeltaU`

D

Standard heat of formation of `CO_(2)=-94.3kcal`

Text Solution

Verified by Experts

The correct Answer is:
D
Standard heat of formation of a chemical is defined as the heat enthalpy change when 1 mole of a substance is formed from its most stable allotropic form. `C_(graph ite)` is most stable allotropic form having `H^(@)C_((graph ite))=0`
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P BAHADUR-THERMOCHEMISTRY-Exercise 3a objective problems
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  2. Consider the reactions : C((s))+2H(2(g)) rarr CH(4(g)), DeltaH=-X kc...

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  3. Which of the following is incorrect about the reaction : underset((D...

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  5. Bond energy of N-H,H-H and N-=N are a,b,c respectively. The DeltaH for...

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  6. If heat of neutralisation is -13.7kcal at 25^(@)C and H(f(H(2)O))^(@)=...

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  7. If (1)/(2)X(2)O((s)) rarr X((s))+(1)/(4)O(2(g)),DeltaH=90kJ then heat ...

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  8. The data given below are for vapour phase reactions at constant pressu...

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  9. The product of combustion of an aliphatic thiol (RSH) at 298K are :

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  10. The bond energy of H(2) is 104.3 kcal mol^(-1) . If means that :

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  11. Heat of neutralisation of NaOH and HCl is -57.46 kJ // equivalent. The...

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  12. The lattice energy of solid NaCI is 180 kcal mol^(-1). The dissolution...

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  13. Heat of neutralisation of HF is :

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  14. The heat of atomisation of PH(3(g)) is 228kcal mol^(-1) and that of P(...

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

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  16. For which reaction DeltaH=DeltaU ?

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

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

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

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