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  1. The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements.

  2. A.

     Less than

    B.

     More than

    C.

     Same as

    D.

     Not related to

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  3. Heat requirement for decomposition of a compound into its elements is __________ that is evolved during the formation of that compound from its elements.

  4. A.

     The same

    B.

     Less than

    C.

     Greater than

    D.

     Different than

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  5. In case of the decomposition of hydroiodic acid (2HI ⇋ H₂ + I₂), addition of H₂ (at equilibrium condition) will

  6. A.

     Increase the partial pressure of I₂

    B.

     Decrease the partial pressure of HI

    C.

     Diminish the degree of dissociation of HI

    D.

     None of these

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  7. __________ does not change during phase transformation processes like sublimation, melting & vaporisation.

  8. A.

     Entropy

    B.

     Gibbs free energy

    C.

     Internal energy

    D.

     All of the above

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  9. Adiabatic compression of a saturated water vapour makes it

  10. A.

     Supersaturated

    B.

     Superheated

    C.

     Both A and B

    D.

     Neither A nor B

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  11. Standard temperature and pressure (S.T.P.) is

  12. A.

     0°C and 750 mm Hg

    B.

     15°C and 750 mm Hg

    C.

     0°C and 1 kgf/cm²

    D.

     15°C and 1 kgf/cm²

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  13. In case of an __________ process, the temperature of the system increases.

  14. A.

     Isothermal compression

    B.

     Isothermal expansion

    C.

     Adiabatic expansion

    D.

     Adiabatic compression

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  15. In a turbine, the fluid expands almost

  16. A.

     Isothermally

    B.

     Isobarically

    C.

     Adiabatically

    D.

     None of these

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  17. Specific/molar Gibbs free energy for a pure substance does not change during

  18. A.

     Sublimation

    B.

     Vaporisation

    C.

     Melting

    D.

     Either A, B or C

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  19. 1st law of thermodynamics is nothing but the law of conservation of

  20. A.

     Momentum

    B.

     Mass

    C.

     Energy

    D.

     None of these

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