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The value of DeltaH(O-H) is 109 kcal mol...

The value of `DeltaH_(O-H)` is `109 kcal mol^(-1)`. Then formation of one mole of water in gaseous state from `H_(2)(g)` and `O_(2)(g)` is acccompained by

A

218 kcal

B

`-109kcal`

C

`-218kcal`

D

unpredictable

Text Solution

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The correct Answer is:
C
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OP TANDON-Chemical Thermodynamics and Thermochemistry-Objective Question Level-A
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  2. Which of the following value of DeltaH(f)^(@) represent that the produ...

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  3. The value of DeltaH(O-H) is 109 kcal mol^(-1). Then formation of one m...

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  4. Heat of neutralisation of a strong dibasic acid in dilute solution by ...

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  5. The enthalpy changes at 298 K in successive breaking of O-H bonds of ...

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  6. The combustion of methane is written as CH(4)(g)+2O(2)(g)toCO(2)(g)+...

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  7. A spontaneous change is one in which a system under goes

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  8. In which of the following change entropy decreases?

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  9. For the percipitation reaction of Ag^(o+) ions with NaCI, which of the...

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  10. If the enthalpy of vaporisation of water is 186.5 J mol^(-1), then ent...

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  11. A reaction is non-spontaneous when:

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  12. Standard entropy of X(2) , Y(2) and XY(3) are 60, 40 and 50JK^(-1)mol...

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  13. The unit of entropy is

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  14. Given that Deltah(f)(H)=218 kJ//mol. Express the H-H bond energy in K ...

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  15. For which reaction from the following, DeltaS will be maximum?

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  16. A particular reaction at 27^(@)C for which DeltaH gt 0 and DeltaS gt 0...

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  18. In general, for exothermic reactions to be spontaneous

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  19. For the reversible process, the value of DeltaS is given by the expres...

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  20. In an electrochemical cell, if E^(@) is the e.m.f. of the cell involvi...

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