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Chemical Engineering :: Stoichiometry

  1. A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)

  2. A.

     350

    B.

     485

    C.

     140

    D.

     345


  3. The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.

  4. A.

     Potential energy

    B.

     Intermolecular forces

    C.

     Kinetic energy

    D.

     Total energy


  5. The total number of atoms in 8.5 gm of NH₃ is __________ x 1023.

  6. A.

     9.03

    B.

     3.01

    C.

     1.204

    D.

     6.02


  7. Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?

  8. A.

     ΔH = 1 (+ ve)and Δ V = -ve

    B.

     ΔH = 0

    C.

     ΔV = 0

    D.

     Both B and C


  9. Number of gm moles of solute dissolved in 1 kg of solvent is called its

  10. A.

     Normality

    B.

     Molarity

    C.

     Molality

    D.

     Formality


  11. If pH value of a solution is 8, then its pOH value will be

  12. A.

     6

    B.

     1

    C.

     7

    D.

     10


  13. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the

  14. A.

     Same elevation in boiling point

    B.

     Different elevation in boiling point

    C.

     Elevation in boiling point in the ratio of their molecular weights

    D.

     None of these


  15. For estimation of heat capacity of a solid compound, one can use

  16. A.

     Clayperon's equation

    B.

     Gibb's equation

    C.

     Kopp's rule

    D.

     Trouton's rule


  17. Dissolving a solute in a solvent does not change its

  18. A.

     Specific heat

    B.

     Vapour pressure

    C.

     Viscosity

    D.

     None of these


  19. Pick out the wrong statement.

  20. A.

     The effect of pressure on heat capacity of gases at pressure above one atmosphere and above the critical temperature is negligible

    B.

     The value of Cp of gases increases with increase in pressure, above atmospheric pressure

    C.

     The value of Cp at critical temperature and pressure reaches infinity

    D.

     All of the above