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Chemical Engineering :: Stoichiometry

  1. In osmosis through a semi-permeable membrane, diffusion of the

  2. A.
    solvent is from low concentration to high concentration region.
    B.
    solvent is from high concentration to low concentration region.
    C.
    solute takes place.
    D.
    none of these.

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  3. A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct ?

  4. A.
    Xc > Xs
    B.
    Xc = Xs .
    C.
    Xc < Xs
    D.
    Xc greater/less than Xs depending on the length of the cylinder

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  5. The temperature at which the second Virial co-efficient of a real gas is zero is called the

  6. A.
    eutectic point
    B.
    Boyle temperature
    C.
    boiling point
    D.
    critical temperature

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  7. The hydroxyl ion (OH-) concentration in a solution having pH value 3 will be

  8. A.
    10-11
    B.
    10-10
    C.
    10-3
    D.
    10-4

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  9. Boiling point of a solution as compared to that of the corresponding solvent is

  10. A.
    less
    B.
    more
    C.
    same
    D.
    either more or less; depends upon the solvent

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  11. Real gases approach ideal behaviour at

  12. A.
    high pressure & high temperature.
    B.
    low pressure & high temperature.
    C.
    high pressure & low temperature.
    D.
    low pressure & low temperature.

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  13. The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the

  14. A.
    temperature & pressure.
    B.
    number of intermediate chemical reactions involved.
    C.
    state of aggregation & the state of combination at the beginning & the end of the reaction.
    D.
    none of these.

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  15. N.T.P. corresponds to

  16. A.
    1 atm.absolute pressure& 0°C.
    B.
    760 mm Hg gauge pressure & 0°C.
    C.
    760 torr & 15°C.
    D.
    101.325 KPa gauge pressure & 0°C.

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  17. During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.

  18. A.
    enthalpy
    B.
    Gibbs free energy
    C.
    internal energy
    D.
    entropy

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  19. Atomic __________ of an element is a whole number.

  20. A.
    weight
    B.
    number
    C.
    volume
    D.
    radius

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