MCQOPTIONS
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MCQOPTIONS
This section includes 103 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
80 kg of Na 2 SO 4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na 2 SO 4 .10H 2 O crystals separate out. The weight fraction of Na 2 SO 4 in the remaining solution is |
| A. | 0.00 |
| B. | 0.18 |
| C. | 0.24 |
| D. | 1.00 |
| Answer» C. 0.24 | |
| 52. |
The molar composition of a gas is 10% H 2 , 10% O 2 , 30% CO 2 and balance H 2 O. If 50% H 2 O condenses, the final mole percent of H 2 in the gas on a dry basis will be |
| A. | 10% |
| B. | 5% |
| C. | 18.18% |
| D. | 20% |
| Answer» E. | |
| 53. |
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 |
| Answer» D. 110.6°C | |
| 54. |
How much O 2 can be obtained from 90 kg of water ? |
| A. | 32 kg |
| B. | 80 kg |
| C. | 64 kg |
| D. | 90 kg |
| Answer» C. 64 kg | |
| 55. |
A gas mixture contains 6 moles of H 2 and 2 moles of N 2 . If the total pressure of the gaseous mixture is 4 kgf/cm 2 ; then the partial pressure of N 2 in the mixture will be __________ kgf/cm 2 . |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» B. 2 | |
| 56. |
A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO 2 , 0.05 gm mole of oxygen and 0.80 gm mole of N 2 . What is its molecular weight ? |
| A. | 28.6 |
| B. | 30.0 |
| C. | 30.6 |
| D. | 32.6 |
| Answer» D. 32.6 | |
| 57. |
A gaseous mixture contains 14 kg of N 2 , 16 kg of O 2 and 17 kg of NH 3 . The mole fraction of oxygen is |
| A. | 0.16 |
| B. | 0.33 |
| C. | 0.66 |
| D. | 0.47 |
| Answer» C. 0.66 | |
| 58. |
The value of ( C p - C v )for a real gas obeying Vander Wall's equation is |
| A. | R |
| B. | > R |
| C. | < R |
| D. | 0.5 R |
| Answer» C. < R | |
| 59. |
The vapour pressure of water is given by, in P sat = A - (5000/ T ), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K .The vapor pressure of water in atm. at 50°C is approximately |
| A. | 0.07 |
| B. | 0.09 |
| C. | 0.11 |
| D. | 0.13 |
| Answer» E. | |
| 60. |
Vapor pressure of a solution is proportional to(where, S v and S t are mole fraction of solvent and solute respectively). |
| A. | S v |
| B. | 1/ S t |
| C. | S t |
| D. | 1/ S v |
| Answer» B. 1/ S t | |
| 61. |
A car tyre of volume 0.057 m 3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is |
| A. | 380 |
| B. | 630 |
| C. | 760 |
| D. | 880 |
| Answer» C. 760 | |
| 62. |
A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be |
| A. | 0°C |
| B. | 0°K |
| C. | -136.5°C |
| D. | -136.5°K |
| Answer» D. -136.5°K | |
| 63. |
1 Kcal/kg. °C is equivalent to __________ BTU/lb. °F. |
| A. | 1 |
| B. | 2.42 |
| C. | 4.97 |
| D. | none of these |
| Answer» B. 2.42 | |
| 64. |
1m 3 is approximately equal to |
| A. | 28 litres |
| B. | 35 ft 3 |
| C. | 4.5 litres |
| D. | 4.5 ft 3 |
| Answer» C. 4.5 litres | |
| 65. |
The vapor pressure of water at 100°C is |
| A. | 100N/m 2 |
| B. | 76 cms of Hg |
| C. | 13.6 cms of Hg |
| D. | 760 mm wc |
| Answer» C. 13.6 cms of Hg | |
| 66. |
A vessel of volume 1000 m 3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately |
| A. | 17 |
| B. | 20 |
| C. | 25 |
| D. | 34 |
| Answer» B. 20 | |
| 67. |
The amount of Zn (atomic weight = 65) required to form 224 c.c. of H 2 at N.T.P. on treatment with dilute H 2 SO 4 will be __________ gm. |
| A. | 0.065 |
| B. | 0.65 |
| C. | 6.5 |
| D. | 65 |
| Answer» C. 6.5 | |
| 68. |
An aqueous solution of 2.45% by weight H 2 SO 4 has a specific gravity of 1.011. The composition expressed in normality is |
| A. | 0.2500 |
| B. | 0.2528 |
| C. | 0.5000 |
| D. | 0.5055 |
| Answer» E. | |
| 69. |
C v for monoatomic gases is equal to(where, R = gas constant) |
| A. | R |
| B. | 1.5 R |
| C. | 2 R |
| D. | 3 R |
| Answer» C. 2 R | |
| 70. |
The heat evolved in the combustion of benzene is represented by the equation: C 6 H 6 + 7.5 O 2 = 6CO 2 + 3H 2 O, ?H = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C 6 H 6 is burnt in an open container, will be __________ kJ/kgmole. |
| A. | +816.15 |
| B. | +1632.3 |
| C. | -1632.3 |
| D. | -2448.45 |
| Answer» D. -2448.45 | |
| 71. |
pH value of H 2 SO 4 (5% concentration) is |
| A. | 5 |
| B. | 7 |
| C. | > 7 |
| D. | < 7 |
| Answer» E. | |
| 72. |
The unit of C p in S.I. units is |
| A. | W/m 2 .°K |
| B. | J/kg.°K |
| C. | W/m.°K |
| D. | J/m 3 . °K |
| Answer» C. W/m.°K | |
| 73. |
C p - C v , for an ideal gas is equal to |
| A. | R |
| B. | R /2 |
| C. | 2 R |
| D. | 3 R |
| Answer» B. R /2 | |
| 74. |
The number of H + in 1 c.c solution of pH 13 is |
| A. | 6.023 xl0 13 |
| B. | 6.023 x 10 10 |
| C. | 6.023xl0 7 |
| D. | 10 13 |
| Answer» D. 10 13 | |
| 75. |
In the reaction, Ca + 2H 2 O = Ca(OH) 2 + H 2 ; 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» B. 2240 | |
| 76. |
Except for monoatomic gases, the molal heat capacity at constant volume for all gases is __________ Kcal/Kg mole.° K. |
| A. | 3 |
| B. | > 3 |
| C. | < 3 |
| D. | < 1 |
| Answer» C. < 3 | |
| 77. |
A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be C p = 29.1 J/mole.°C and, C v = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is |
| A. | 13728 J |
| B. | 19206 J |
| C. | 4576 J |
| D. | 12712 J |
| Answer» C. 4576 J | |
| 78. |
40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is |
| A. | 1/2 |
| B. | 1/3 |
| C. | 1/4 |
| D. | 2/3 |
| Answer» C. 1/4 | |
| 79. |
1 Pascal (unit of pressure) is equal to __________ N/m 2 . |
| A. | 10 |
| B. | 1 |
| C. | 0.1 |
| D. | 1000 |
| Answer» C. 0.1 | |
| 80. |
The number of atoms of oxygen present in 11.2 litres of ozone (O 3 ) at N.T.P. are |
| A. | 3.01 x 10 22 |
| B. | 6.02 x 10 23 |
| C. | 9.03 x 10 24 |
| D. | 1.20 x 10 24 |
| Answer» D. 1.20 x 10 24 | |
| 81. |
Kinematic viscosity of 1 m 2 /second is equivalent to __________ stokes. |
| A. | 10 |
| B. | 10 2 |
| C. | 10 3 |
| D. | 10 4 |
| Answer» E. | |
| 82. |
1 kg of calcium carbide (CaC 2 ) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ? |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» C. 15 | |
| 83. |
The pressure of ' V ' litres of a dry gas is increased from 1 to 2 kgf/cm 2 at a constant temperature. The new volume will become |
| A. | V /2 |
| B. | 2 V |
| C. | V /4 |
| D. | V 2 |
| Answer» B. 2 V | |
| 84. |
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. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water X w in the vapour phase satisfies |
| A. | 0 < X w < 0.5 |
| B. | X w = 0.5 |
| C. | 0.5 < X w < 1.0 |
| D. | X w = 1.0 |
| Answer» D. X w = 1.0 | |
| 85. |
The hydroxyl ion (OH - ) concentration in a solution having pH value 3 will be |
| A. | 10 -11 |
| B. | 10 -10 |
| C. | 10 -3 |
| D. | 10 -4 |
| Answer» B. 10 -10 | |
| 86. |
A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are X c and X s respectively. Which of the following statement is correct ? |
| A. | X c > X s |
| B. | Xc = X s . |
| C. | X c < X s |
| D. | X c greater/less than X s depending on the length of the cylinder |
| Answer» D. X c greater/less than X s depending on the length of the cylinder | |
| 87. |
Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m 3 . The diffusivity of aniline in air is 0.74xl0 -5 m 2 /s.The numerical value of mass transfer co-efficient is 7.4 x 10 -3 . The rate of evaporation of aniline is 2.97 x 10 -4 . Its units are |
| A. | mole/s |
| B. | mole/cm 2 . s |
| C. | mole/m 2 . s |
| D. | kmole/m 2 . s |
| Answer» E. | |
| 88. |
C p equals C v at |
| A. | 0°C |
| B. | 0°K |
| C. | 0°F |
| D. | 0°R |
| Answer» C. 0°F | |
| 89. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH 4 + 2O 2 ? CO 2 + 2H 2 O. Both the reactants and products are in gas phase. ?H° 298 = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about |
| A. | 0.19 |
| B. | 0.33 |
| C. | 0.40 |
| D. | 0.67 |
| Answer» B. 0.33 | |
| 90. |
The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol X M satisfies |
| A. | X M < 0.5 |
| B. | X M = 0.5 |
| C. | 0.5 < X M < 0.64 |
| D. | X M ? 0.64 |
| Answer» E. | |
| 91. |
1 kgf/cm 2 is not equal to |
| A. | 1 torr |
| B. | 1 bar |
| C. | 10000 mm wc |
| D. | 100 KPa = 100 000 N/m 2 |
| Answer» B. 1 bar | |
| 92. |
6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H 2 produced will be __________ gm. |
| A. | 0.5 |
| B. | 1 |
| C. | 3 |
| D. | 5 |
| Answer» B. 1 | |
| 93. |
At room temperature, the product [H + ] [OH - ] in a solution is 10 -14 moles/litre. If, [OH - ] = 10 -6 moles/litre, then the pH of the solution will be |
| A. | 6 |
| B. | 8 |
| C. | 10 |
| D. | 12 |
| Answer» C. 10 | |
| 94. |
Vapor pressure of water at 100°C is about __________ bar. |
| A. | 0.1013 |
| B. | 1.013 |
| C. | 10.13 |
| D. | 101.3 |
| Answer» C. 10.13 | |
| 95. |
Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C). |
| A. | °API = 200(G - 1) |
| B. | °API = (141.5/G) - 131.5 |
| C. | °API = (140/G) - 130 |
| D. | °API = 145 - (145/G) |
| Answer» C. °API = (140/G) - 130 | |
| 96. |
A sample of well water contains 140 gm/m 3 Ca 2+ ions and 345 gm/m 3 Na + ions. The hardness of the sample of water, expressed in terms of equivalent CaCO 3 in gm/m 3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) |
| A. | 350 |
| B. | 485 |
| C. | 140 |
| D. | 345 |
| Answer» B. 485 | |
| 97. |
N 2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60) |
| A. | 80% |
| B. | 90% |
| C. | 95% |
| D. | 98% |
| Answer» C. 95% | |
| 98. |
Density of carbon dioxide is __________ kg/Nm 3 . |
| A. | 44/22400 |
| B. | 44/22.4 |
| C. | 22.4/44 |
| D. | none of these |
| Answer» C. 22.4/44 | |
| 99. |
Equal masses of CH 4 and H 2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is |
| A. | 1/9 |
| B. | 8/9 |
| C. | 1/2 |
| D. | 5/9 |
| Answer» C. 1/2 | |
| 100. |
Heat capacity of air can be approximately expressed as, C p = 26.693 + 7.365 x10 -3 T , where, C p is in J/mole. K and T is in K . The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is |
| A. | 10.73 kJ |
| B. | 16.15 kJ |
| C. | 18.11 kJ |
| D. | 18.33 kJ |
| Answer» D. 18.33 kJ | |