Practice Test Stoichiometry - Set 19 - ObjectiveBooks

# Practice Test: Question Set - 19

1. 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
(A) Less than 100°C
(B) 100°C
(C) Between 100 and 110°C
(D) 110.6°C

2. A flowsheet is given in the following figure: If the single pass once through conversion of A to B is 20%, then the rate of recycle R (molds/hr) is
(A) 300
(B) 400
(C) 500
(D) 600

3. At 100°C, water and methylcyclohexane both have vapor pressures of 1 atm. Also at 100°C, the latent heats of vaporization of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapor pressure of water at 150°C is 4.69 atm. At 150°C, the vapor pressure of methylcyclohexane would be expected to be
(A) Significantly less than 4.69 atm
(B) Nearly equal to 4.69 atm
(C) Significantly more than 4.69 atm
(D) Indeterminate due to lack of data

4. If pH value of a solution is 8, then its pOH value will be
(A) 6
(B) 1
(C) 7
(D) 10

5. In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is
(A) Independent of temperature
(B) Increases with rise in pressure
(C) Increased with decrease in pressure
(D) Unchanged with pressure changes

6. The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is
(A) 15.5
(B) 16
(C) 16.5
(D) 17

7. 1 ata is equivalent to
(A) 1 atm
(B) 10 torr
(C) 0.98 Pascal
(D) 1 kgf/cm2

8. S.T.P. corresponds to
(A) 1 atm. absolute pressure & 15.5°C
(B) 760 mm Hg gauge pressure & 15.5°C
(C) 760 torr & 0°C
(D) 101.325 kPa gauge pressure & 15.5°C

9. In a binary liquid system, the composition expressed as __________ is independent of the temperature & pressure.
(A) Kg of solute/kg of solvent
(B) Kg-mole of solute/kg-mole of solvent
(C) Kg-mole of solute/1000 kg of solvent
(D) All (a), (b) & (c)

10. In general, the specific heats of aqueous solutions __________ with increase in the concentration of the solute.
(A) Increase
(B) Decrease
(C) Remain unchanged
(D) None of these

11. The value of gas constant 'R' is __________ kcal/kg.mole.°C.
(A) 2.79
(B) 1.987
(C) 3.99
(D) None of these

12. The chemical nature of an element is independent of
(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

13. Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively).
(A) Sv
(B) 1/St
(C) St
(D) 1/Sv

14. For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise.
(A) Sodium chloride
(B) Sodium carbonate monohydrate
(C) Anhydrous sodium sulphate
(D) Hypo

15. "The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements." This is the statement of
(A) Law of Petit and Dulong
(B) Kopp's rule
(C) Nernst heat theorem
(D) Trouton's rule

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