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The enthalpies of elements under the fol...

The enthalpies of elements under the following conditions are assumed to be

A

zero at 298K and 1 atm

B

Unity at 298K and 1 atm

C

zero at 273K and 1 atm

D

Unity at 273K and 1 atm

Text Solution

Verified by Experts

The correct Answer is:
A
Standard state = 298 K & 1 atm
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AAKASH SERIES-CHEMICAL THERMODYNAMICS-LECTURE SHEET (EXERCISE-II) (LEVEL - I(MAIN) STRAIGHT OBJECTIVE TYPE QUESTIONS)
  1. The factor which does not influence that heat of the reaction is

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  2. Assertion(A ): The enthalpies of elements in their standard states are...

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  3. The enthalpies of elements under the following conditions are assumed ...

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  4. For which one of the following systems DE lt DH

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  5. Which of the following relationships is correct for a reaction involvi...

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  6. For the reaction , FeCO(3(s)) rarr FeO((s)) + CO(2(g)), Delta H= 82.8k...

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  7. The correct is

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  8. Which are of the following is an exothermic reaction?

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  9. The formation of water from H(2(g)) and O(2(g)) is an exothermic react...

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  10. The enthalpy of elements in their standard states are taken as zero. H...

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  11. Identify the reaction in which the heat liberated corresponds to the h...

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  12. In which of the following equations Delta H^(0) reaction equal to Delt...

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  13. C("graphite") + O(2(g)) : Delta H = -393.5 kJ. Delta H of the above re...

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  14. Given that (1)/(2)S(8(s)) + 6O(2(g)) rarr 4SO(3(g)), Delta H^(0) = - 1...

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  15. DeltaH^(0) for a reaction F(2) + 2HCl rarr 2HF + Cl(2) is given as -35...

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  16. The standard enthalpies of formation of H(2)O(2(l)) and H(2)O((l)) " a...

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  17. The heats of combustion of carbon hydrogen and acetylene are -394kJ, -...

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

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  19. Work done during the combustion of one mole of CH(4) in bomb calorimet...

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  20. The heats of combustion of ethane, ethene and acetylene are -341.1 kca...

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