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The enthalpies of formation of all the e...

The enthalpies of formation of all the elements in their standard states are

A

Unity

B

Zero

C

`gt` Zero

D

`lt 1` but `gt 0`

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The correct Answer is:
B
The enthalpy of formation of an element in its standard state is zero.
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DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
  1. According to the diagram given below, the value of DeltaH for conversa...

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  2. When ammonium chloride is dissolved in water, the solution becomes col...

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  3. The enthalpies of formation of all the elements in their standard stat...

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  4. A monoatomic neon molecule possesses

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  5. The heat of combusion of benzne determined in a bomb calorimeter is -8...

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  6. An endothermic reaction is allowed to take place very rapidly in the a...

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  7. The heat absorbed in a reaction at constant temperature and constant v...

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  8. In endothermic reactions

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  9. For the reaction, 2NH(3)(g)toN(2)(g)+3H(2)(g), which of the followin...

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  10. The heat of reaction at constant volume (DeltaE) and that at constant ...

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  11. Under which of the following condition is the relation DeltaH = DeltaU...

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  12. For the gaseous reaction: N(2)O(4) rarr 2NO(2)

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  13. The heat of combustion of solid benzoic acid at constant volume is -32...

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  14. For hypothetical reaction A(g) + B(g) to C(g) + D(g) Which of the ...

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  15. DeltaE^(@) of combustion of isobutylene is -X kJ mol^(-1). The value o...

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  16. The difference between DeltaH and Delta E at constant voluem is equal ...

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  17. The reaction given below BaCI(2)(s) +2H(2)O(l) rarr BaCI(2).2H(2)O,D...

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  18. Enthalpy change of the reaction 2H(g) to H(2)(g) is -104 kcal The ...

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  19. According to latest sign conventions, the correct expression represent...

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  20. 'If a system A is in thermal equilibrium with B and B is in thermal eq...

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