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Standard molar enthalpy is lowest for...

 Standard molar enthalpy is lowest for

A

Diamond carbon

B

Graphite carbon

C

Water vapour

D

Liquid water

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The correct Answer is:
D
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If the standard molar enthalpy of formation of CaO_((s)), CO_(2(s)) and CaCO_(3(s)) is -635, -393 and -1207kJ "mol"^(-1) respectively, the Delta_r H^(o.) in kJ mol^(-1) for the reaction CaCO_(3(s)) rarr CaO_((s)) + CO_(2(g)) is

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For which of the following elements, the standard enthalpy is not zero?

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AAKASH SERIES-CHEMICAL THERMODYNAMICS-PRACTICE EXERCISE
  1. If the heats of formation of Al2O3 and Fe2O3 are -400 K.Cal and -190 K...

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  2. When 1 litre of IM HCl is mixed with 1 litre of 1M NaOH, the rise in t...

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  3. Standard molar enthalpy is lowest for

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  4. Lattice dissociation energy and hydration energy of sodium chloride ar...

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  5. Example of endothermic product is

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  6. If (I)C + O2 rarr CO2 , Q1 (II) C+1//2 O2 rarr CO , Q2 (III) CO + ...

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  7. The enthalpy of formation of N2O((g)) and NO((g)) are 82.0 KJ and 90 K...

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  8. The heats of formation of CO2, H2O and C2H4 are -94.05, -68.2 and 12.6...

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  9. Given that C + O2 rarr CO(2) , DeltaH^@ = -xkJ 2CO + O2 rarr 2CO2 , ...

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  10. The enthalpy of formation of ammonia is -46.0 KJ mol^(-1). The enthalp...

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  11. Which of the following bond has highest enthalpy

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  12. 2C((s))  + 1/2O(2(gg) rarr CO(2(g)) , DeltaH = -787 KJ H(2(g)) + 1/2...

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  13. Heats of combustion of C2H4, H2 and C2H6 are -1409 K.J, -285 K.J and -...

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  14. The enthalpy of combustion of cyclohexane cyclohexene and H2 are respe...

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  15. Given that CH3CHO + 5/2O2 rarr 2CO2 + 2H2O, DeltaH = -1168 KJ//"mole...

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  16. The enthalpy of vapourisation of a liquid is 30 KJ mol^(-1) and entrop...

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  17. H(2(g)) rarr 2H((g)) , DeltaH = 400 KJ , then DeltaS("system") at 2000...

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  18. Show that A ∪ B = A ∩ B implies A = B

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  19. Standard molar entropies of Mg((s)) , C((s)), MgO((s)) & CO((g)) respe...

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  20. DeltaH and DeltaS for certain reaction are -10KJ and - 44J/K, DeltaG^@...

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