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The enthalpy of elements in their standa...

The enthalpy of elements in their standard states are taken as zero. Hence the enthalpy of formation of a compound is

A

always negative

B

always positive

C

positive (or) negative

D

equal to zero

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The correct Answer is:
C
`Delta H_(f)` can be `xx 0`
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AAKASH SERIES-CHEMICAL THERMODYNAMICS-LECTURE SHEET (EXERCISE-II) (LEVEL - I(MAIN) STRAIGHT OBJECTIVE TYPE QUESTIONS)
  1. The correct is

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

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

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

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

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

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

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

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

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

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

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

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

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

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  15. The enthalpy change for the process C(("graphite")) rarr C(g), Delta H...

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  16. Enthalpy of neutralisation of all strong acids and strong bases has th...

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  17. H(2)SO(4(aq)) + 2KOH((aq)) rarr K(2)SO(4(aq)) + 2H(2)O((l)), Delta H f...

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  18. The enthalpy change for the reaction C(2)H(6(g)) rarr 2C((g)) + 6H((g)...

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  19. The bond dissociation energies for Cl(2),I(2) and Icl are 242.3, 151 a...

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  20. What is the bond enthalpy of Xe-F bond? XeF(4)(g) rarr Xe^(+) (g) + F^...

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