Multiple Choice Questions and Answers on Chemical Engineering Stoichiometry
01. In the reaction, Ca + 2H2O = Ca(OH)2 + H2; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water ? (Atomic weight of calcium = 40)
(A) 4480
(B) 2240
(C) 1120
(D) 0.4
Answer: Option A
02. A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor.
(A) Saturated
(B) Supersaturated
(C) Superheated
(D) None of these
Answer: Option C
03. Dissolving a solute in a solvent does not change its
(A) Specific heat
(B) Vapour pressure
(C) Viscosity
(D) None of these
Answer: Option D
04. Applicability of Clausius-Clapeyron Equation is subject to the condition that the
(A) Vapor follows ideal gas law
(B) Volume in the liquid state is negligible
(C) Both (A) & (B)
(D) Neither (A) nor (B)
Answer: Option C
05. ‘Cox’ chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the
(A) Temperature vs. log (vapor pressure)
(B) Vapor pressure vs. log (temperature)
(C) Log (temperature) vs. log (vapor pressure)
(D) Vapor pressure vs. temperature
Answer: Option A
06. The reaction A + B → C has been conducted in a reactor as shown below. The number of boundaries around which material balance can be written, are
(A) 1
(B) 6
(C) 3
(D) 4
Answer: Option D
07. Methane is mixed with stoichiometric proportion of oxygen and completely combusted. The number of additional specifications required to determine the product flow rate and composition is
(A) 0
(B) 1
(C) 2
(D) 3
Answer: Option A
08. The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 × __________.
(A) 1026
(B) 1023
(C) 1020
(D) 1019
Answer: Option C
09. Concentration of a solution expressed in terms of __________ is independent of temperature.
(A) Molarity
(B) Normality
(C) Molality
(D) None of these
Answer: Option C
10. The amount of Zn (atomic weight = 65) required to form 224 c.c. of H2 at N.T.P. on treatment with dilute H2SO4will be __________ gm.
(A) 0.065
(B) 0.65
(C) 6.5
(D) 65
Answer: Option B
11. Pick out the correct conversion.
(A) 1 BTU =453.6 calories
(B) 1 BTU = 252 calories
(C) 1 calorie = 252 BTU
(D) 1 calorie = 453.6 BTU
Answer: Option B
12. A vapor that exists above its critical temperature is termed as a __________ vapor.
(A) Saturated
(B) Unsaturated
(C) Gaseous
(D) Sub-cooled
Answer: Option C
13. Othmer chart is useful in estimating the heat of
(A) Mixing
(B) Wetting
(C) Adsorption
(D) None of these
Answer: Option C
14. Pick out the wrong unit conversion of temperature.
(A) °R = 273 + °F
(B) Temperature difference of 1°K = 1°C = 9/5°F
(C) °C = (F- 32) × 0.555
(D) °F = (°C + 17.778) × 1.8
Answer: Option A
15. Pick out the wrong unit conversion of heat transfer rate.
(A) 1 kcal/hr= 1.163 Watt
(B) 1 Watt = 1.163 kcal/hr
(C) 1 BTU/ft2.hr = 2.712 kcal/m2.hr
(D) 1 kcal/m2.hr = 0.3687 BTU/ft2.hr = 1.163 Watt/m2
Answer: Option B
16. Viscosity of 1 centipoise is equal to 1 Centistoke in case of
(A) Water
(B) Mercury
(C) Carbon tetrachloride
(D) None of these
Answer: Option A
17. °API gravity of water at N.T.P. is about
(A) 0
(B) 1
(C) 10
(D) 100
Answer: Option C
18. Colligative properties of a dilute solution are those which depend entirely upon the
(A) Constitution of the solute
(B) Chemical composition of the solute
(C) Number of solute molecules contained in a given volume of the solvent
(D) None of these
Answer: Option A
19. Which of the following is insensitive to changes in pressure?
(A) Heat of vaporisation
(B) Melting point
(C) Heat of fusion
(D) Both (B) and (C)
Answer: Option D
20. The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg.mole respectively. The order of decreasing inter-molecular forces in these liquids is
(A) H2O > C2H5OH > CS2
(B) CS2 > C2H5OH > H2O
(C) H2O > CS2 > C2H5OH
(D) CS2 > H2O > C2H5OH
Answer: Option A
21. 1 BTU/lb.←°F is equivalent to __________ kcal/kg.°C.
(A) 1
(B) 2.42
(C) 1.987
(D) 4.97
Answer: Option A
22. The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the
(A) Nature of both the gas & the liquid
(B) Temperature
(C) Total pressure
(D) None of these
Answer: Option D
23. A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be __________ c.c.
(A) 283
(B) 566
(C) 293
(D) 141.5
Answer: Option C
24. Heat of __________ of a fuel is called its calorific value.
(A) Formation
(B) Combustion
(C) Reaction
(D) Vaporisation
Answer: Option B
25. Dry air is a mixture of
(A) Vapors
(B) Gases
(C) Both (A) & (B)
(D) Neither (A) nor (B)
Answer: Option B