Multiple Choice Questions on Stoichiometry with Answers - Set 05 - ObjectiveBooks

# Practice Test: Question Set - 05

1. Pick out the wrong statement about the recycle stream in a process.
(A) Recycling in a process stream helps in utilizing the valuable reactants to the maximum with minimum loss of reactants
(B) The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio
(C) Recycling in a process does not help in getting higher extent of reaction
(D) Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column

2. Which of the following expressions defines the Baume gravity scale for liquids lighter than water?
(A) °Be = (140/G) - 130
(B) °Be = 200(G-1)
(C) °Be = 145 - (145/G)
(D) °Be = (400/G) - 400

3. Osmotic pressure of the solution can be increased by
(A) Decreasing its temperature
(B) Increasing the volume of the vessel containing the solution
(C) Diluting the solution
(D) None of these

4. Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the
(A) Vapor follows the ideal gas law
(B) Molal latent heat of vaporization is constant within the limited temperature range
(C) Volume in the liquid state is negligible compared with that in the vapor state
(D) All (a), (b) & (c)

5. Two solutions A1 and A2 have pH value of 2 and 6 respectively. It implies that the solution
(A) A2 is more alkaline than solution A2
(B) A1 is highly acidic
(C) A1 is very slightly acidic
(D) Both (a) & (c)

6. 1 gm mole of an alcohol whose molecular weight is 74 contains 48 gms of carbon, 10 gms of hydrogen and 16 gms of oxygen. Its molecular formula is
(A) C4H9OH
(B) C3H21OH
(C) (C2H4)2H2.OH
(D) C2H33OH

7. 1 bar is almost equal to __________ atmosphere.
(A) 1
(B) 10
(C) 100
(D) 1000

8. Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalization is based on the assumption that the
(A) Sizes of the component molecules are approximately equal
(B) Attractive forces between like and unlike molecules are approximately equal
(C) Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution
(D) All (a), (b) & (c)

9. In physical adsorption, as compared to chemisorption, the
(A) Quantity adsorbed per unit mass is higher
(B) Rate of adsorption is controlled by the resistance to surface reaction
(C) Activation energy is very high
(D) Heat of adsorption is very large

10. The increase in the temperature of the aqueous solution will result in decrease of its
(A) Weight % of the solute
(B) Mole fraction of the solute
(C) Molarity
(D) Molality

11. If 1.5 moles of oxygen combines with aluminium to form Al2O3, then the weight of aluminium (atomic weight = 27) used in this reaction is __________ gm.
(A) 27
(B) 54
(C) 5.4
(D) 2.7

12. The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state.
(A) Less
(B) More
(C) Same
(D) Either (a) or (b); depends on the nature of the substance

13. The number of H+ in 1 c.c solution of pH 13 is
(A) 6.023 × 1013
(B) 6.023 × 1010
(C) 6.023 × 107
(D) 1013

14. In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?
(A) Use of equation of state
(B) Fugacity co-efficient
(C) Activity co-efficient
(D) None of these

15. The combustion equations of carbon and carbon monoxide are as follows:

C + O2 = CO2, ΔH = - 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = - 284.5 kJ/kg. mole.
The heat of formation of CO is __________ kJ/kg. mole.

(A) -109.5
(B) +109.5
(C) +180
(D) +100

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