stoichiometry chemical-engineering question and answers -Page 26

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Home Aptitude

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

3. Which of the following is not used for computing latent heat of vaporisation?
Options
A. Clausius-Clayperon equation
B. Reference substance plots based on Durhing & Othmer plots
C. Kistyakowasky's equation
D. Hess's law of constant heat summation

4. Pick out the wrong statement.
Options
A. To make 100 kg of a solution containing 40% salt by mixing solution A (containing 25% salt) and solution B (containing 50% salt), the amount of solution A required is 40 kg.
B. 1.2 gm atoms of carbon and 1.5 gm moles of oxygen are reacted to give 1 gm mole of carbon dioxide. The limiting reactant is carbon. The percent excess reactant supplied is 25.
C. A gas bubble at a pressure of P_g is passed through a solvent with a saturation vapour pressure of Ps. If the time of passage of the bubble is long and air is insoluble in the solvent, the mole fraction of solvent in the bubble will be equal to P_s/P_g.
D. A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C₁. The output rate of solids from an efficient crystalliser is (C + C₁) V.

6. Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the
Options
A. recycling
B. purging
C. bypassing
D. recirculation

7. In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is
Options
A. independent of the temperature.
B. increased with the increase in pressure.
C. decreased with the increase in pressure.
D. unchanged by the pressure change.
E. none of these

8. At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to
Options
A. decrease in mean free path.
B. increased collision rate among molecules.
C. increase in molecular attraction.
D. increase in average molecular speed.

9. For water evaporating into usaturated air under adiabatic conditions and at constant pressure, the __________ remains constant throughout the period of vaporisation.
Options
A. dry bulb temperature
B. wet bulb temperature
C. humidity
D. relative saturation

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