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Chemical Engineering :: Stoichiometry

  1. Avogadro number is the number of molecules in one __________ of a gas.

  2. A.

     Gram

    B.

     Kilogram

    C.

     Gm.mole

    D.

     Litre


  3. The number of atoms of oxygen present in 11.2 litres of ozone (O₃) at N.T.P. are

  4. A.

     3.01 x 10²²

    B.

     6.02 x 10²³

    C.

     9.03 x 10²⁴

    D.

     1.20 x 10²⁴


  5. The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. The temperature at which the above mixture will exert a pressure of one standard atm. is

  6. A.

     Less than 100°C

    B.

     100°C

    C.

     Between 100 and 110°C

    D.

     110.6°C


  7. Roult's law is obeyed by a __________ solution.

  8. A.

     Saturated

    B.

     Molar

    C.

     Normal

    D.

     None of these


  9. The quantity of heat required to evaporate 1 kg of a saturated liquid is called

  10. A.

     Specific heat

    B.

     1 Kcal

    C.

     Sensible heat

    D.

     Latent heat


  11. Pick out the wrong statement.

  12. A.

     Raoult

    B.

     Molecules with symmetrical arrangement (e.g., CH₄ and CCl₄) are non-polar

    C.

     Most of the hydrocarbons are nonpolar

    D.

     Generally, nonpolar compounds are chemically inactive, conduct electricity poorly and do not ionise


  13. A car tyre of volume 0.057 m³ is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is

  14. A.

     380

    B.

     630

    C.

     760

    D.

     880


  15. The chemical nature of an element is independent of

  16. A.

     Its atomic number

    B.

     The number of protons or electrons present in it

    C.

     The number of neutrons present in it

    D.

     None of these


  17. The osmotic pressure of a solution increases, if its __________ is decreased.

  18. A.

     Volume

    B.

     Solute concentration

    C.

     Temperature

    D.

     None of these


  19. The evaporation of aqueous solution of sugar causes its molarity to

  20. A.

     Decrease.

    B.

     increase.

    C.

     Remain unchanged.

    D.

     Either A or B; depends on the concentration of the solution.