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Hess's law states that :...

Hess's law states that :

A

Changes in heat of reaction

B

Rate of reaction

C

Equilibrium constant

D

Influence of pressure on volume of a gas

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Verified by Experts

The correct Answer is:
A
This law states that, if a reaction is the sum of two or more constituent reactions, then `Delta H` (enthalpy change) for the overall process must be sum of the `Delta H` (heats) of the constituent reactions. In other words, the enthalpy change for a reaction is the same whether it occurs in one step or in a series of steps. Hence, answer is (1)
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VMC MODULES ENGLISH-CHEMICAL THERMODYNAMICS -PRACTICE EXERCISE
  1. A gas present at 5 atm pressure expands against one atmosphere when it...

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  2. The work done by the system in a cyclic process involving one mole of ...

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  3. During the isothermal expansion of an ideal gas, its internal energy...

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  4. A system does 100J work on surroundings by absorbing 150J of heat. Cal...

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  5. A system is provided 50J of heat and work done on the system is 20J. W...

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  6. How is heat content at constant pressure and that at constant volume b...

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  7. If the heat of combustion of pentane is 3507 kJ mol^(-1) then its calo...

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  8. Given examples of four spontaneous process you observe in nature

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  9. If an egg is boiled then does entropy increase or decrease ?

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  10. If a process is non - spontaneous then can it be done by providing ene...

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  11. If a process has Delta H = 548.3 kJ and Delta S = 32 J/mole at 298 K t...

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  12. What does Delta G = 0 represent ?

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  13. For a process such as I(2)(s)hArr I(2)(g) if equilibrium is establishe...

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  14. Which one of the following is correct ?

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  15. For a spontaneous process :-

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  16. A process will be spontaneous at all temperature if:

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  17. The enthalpy of elements in their standard states are taken as zero .T...

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  18. According to the diagram given below. The value of Delta H for conver...

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  19. The law of Lavoisier and Laplace illustrates

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  20. Hess's law states that :

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