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MCQOPTIONS
This section includes 689 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. |
- , for an ideal gas is equal to |
| A. | /2 |
| B. | 2 |
| C. | 3 |
| Answer» B. 2 | |
| 52. |
The number of H in 1 c.c solution of pH 13 is |
| A. | 6.023 xl0 |
| B. | 6.023 x 10 |
| C. | 6.023xl0 |
| D. | 10 |
| Answer» D. 10 | |
| 53. |
pH value of HSO (5% concentration) is |
| A. | 5 |
| B. | 7 |
| C. | > 7 |
| D. | < 7 |
| Answer» E. | |
| 54. |
A gas mixture contains 6 moles of H and 2 moles of N. If the total pressure of the gaseous mixture is 4 kgf/cm ; then the partial pressure of N in the mixture will be __________ kgf/cm . |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» B. 2 | |
| 55. |
How much O can be obtained from 90 kg of water ? |
| A. | 32 kg |
| B. | 80 kg |
| C. | 64 kg |
| D. | 90 kg |
| Answer» C. 64 kg | |
| 56. |
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 | |
| 57. |
Vapor pressure of a solution is proportional to(where, and are mole fraction of solvent and solute respectively). |
| A. | 1/ |
| B. | 1/ |
| Answer» B. 1/ | |
| 58. |
The vapour pressure of water is given by, in = - (5000/), where A is a constant, Psat is the vapour pressure in atm. and is the temperature in .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. | |
| 59. |
The value of Trouton's ratio (/) for a number of substances is 21 (where, = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and = normal boiling point, °K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids. |
| A. | polar |
| B. | non-polar |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 60. |
For an endothermic reaction, the minimum value of energy of activation will be (where, Δ = enthalpy of the reaction) |
| A. | Δ |
| B. | >Δ |
| C. | <Δ |
| D. | 0 |
| Answer» C. <Δ | |
| 61. |
1 BTU/ft is approximately equal to __________ kcal/m. |
| A. | 1 |
| B. | 9 |
| C. | 4 |
| D. | 252 |
| Answer» C. 4 | |
| 62. |
At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour 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 |
| Answer» D. indeterminate due to lack of data | |
| 63. |
The value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be |
| A. | basic |
| B. | more acidic |
| C. | neutral |
| D. | of the same acidity |
| Answer» B. more acidic | |
| 64. |
is expressed in S.I. unit as |
| A. | J/kg.°K |
| B. | 0°K |
| C. | W/m |
| D. | . °C |
| E. | W/m. °K |
| Answer» B. 0°K | |
| 65. |
1 kg/m is equal to __________ mm water column. |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 10 | |
| 66. |
An equation for calculating vapour pressure is given by, log P = A - B(t + c). This is called the |
| A. | Kistyakowsky equation |
| B. | Antonic equation |
| C. | Kopp's rule |
| D. | Trouton's rule |
| Answer» C. Kopp's rule | |
| 67. |
__________ kg of CaC0 on heating will give 56 kg of CaO. |
| A. | 56 . |
| B. | 100 |
| C. | 144 |
| D. | 1000 |
| Answer» C. 144 | |
| 68. |
Enthalpy of formation of NH is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH → N + 3H, is equal to __________ kJ/kg. mole. |
| A. | 46 |
| B. | 92 |
| C. | -23 |
| D. | -92 |
| Answer» C. -23 | |
| 69. |
1 BTU/lb.°F is equivalent to __________ kcal/kg.°C. |
| A. | 1 |
| B. | 2.42 |
| C. | 1.987 |
| D. | 4.97 |
| Answer» B. 2.42 | |
| 70. |
For a neutral solution (pH = 7), the value of[H] [OH] is equal to |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» C. < 1 | |
| 71. |
A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO, 0.05 gm mole of oxygen and 0.80 gm mole of N. What is its molecular weight ? |
| A. | 28.6 |
| B. | 30.0 |
| C. | 30.6 |
| D. | 32.6 |
| Answer» D. 32.6 | |
| 72. |
A gaseous mixture contains 14 kg of N, 16 kg of O and 17 kg of NH. The mole fraction of oxygen is |
| A. | 0.16 |
| B. | 0.33 |
| C. | 0.66 |
| D. | 0.47 |
| Answer» C. 0.66 | |
| 73. |
The value of ( - )for a real gas obeying Vander Wall's equation is |
| A. | R |
| B. | > R |
| C. | < R |
| D. | 0.5 R |
| Answer» C. < R | |
| 74. |
For a given mass of a gas at constant temperature, if the volume '' becomes three times, then the pressure '' will become |
| A. | /3 |
| B. | 3 |
| C. | 9 |
| D. | 9 |
| Answer» B. 3 | |
| 75. |
One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m. It cools to 98°C ; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m. The latent heat of condensation (kJ/kg ) under these conditions is |
| A. | 40732 |
| B. | 2676 |
| C. | 2263 |
| D. | 540 |
| Answer» D. 540 | |
| 76. |
The combustion equations of carbon and carbon monoxide are as follows:C + O = CO, ΔH = - 394 kJ/kg . mole CO + 1/2 O = CO, 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 |
| Answer» B. +109.5 | |
| 77. |
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» E. | |
| 78. |
1m is approximately equal to |
| A. | 28 litres |
| B. | 35 ft |
| C. | 4.5 litres |
| D. | 4.5 ft |
| Answer» C. 4.5 litres | |
| 79. |
A vessel of volume 1000 m 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 | |
| 80. |
The value of gas constant '' is __________ kcal/kg.mole.°C. |
| A. | 2.79 |
| B. | 1.987 |
| C. | 3.99 |
| D. | none of these |
| Answer» E. | |
| 81. |
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 | |
| 82. |
For the gaseous phase reaction, N + O2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by |
| A. | increasing the concentration of N |
| B. | . |
| C. | decrease in temperature. |
| D. | increase in pressure. |
| E. | decrease in pressure. |
| Answer» C. decrease in temperature. | |
| 83. |
A car tyre of volume 0.057 m 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 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 | |
| 84. |
The amount of Zn (atomic weight = 65) required to form 224 c.c. of H at N.T.P. on treatment with dilute HSO will be __________ gm. |
| A. | 0.065 |
| B. | 0.65 |
| C. | 6.5 |
| D. | 65 |
| Answer» C. 6.5 | |
| 85. |
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 | |
| 86. |
An aqueous solution of 2.45% by weight HSO 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. | |
| 87. |
In the reaction, Ca + 2HO = Ca(OH) + H ; 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 | |
| 88. |
The heat evolved in the combustion of benzene is represented by the equation: CH + 7.5 O = 6CO + 3HO, ΔH = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of CH 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 | |
| 89. |
The density of a gas at N.T.P.is 'ρ'. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become at a temperature of __________ °K |
| A. | 273° |
| B. | 300° |
| C. | 400° |
| D. | 300° |
| Answer» D. 300° | |
| 90. |
For the gaseous phase reaction, N2 + O22NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by |
| A. | increasing the concentration of N2. |
| B. | decrease in temperature. |
| C. | increase in pressure. |
| D. | decrease in pressure. |
| Answer» C. increase in pressure. | |
| 91. |
Enthalpy of formation of NH3 is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 → N2 + 3H2, is equal to __________ kJ/kg. mole. |
| A. | 46 |
| B. | 92 |
| C. | -23 |
| D. | -92 |
| Answer» C. -23 | |
| 92. |
The combustion equations of carbon and carbon monoxide are as follows:C + O2 = CO2, ΔH = - 394 kJ/kg . mole CO + 1/2 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 |
| Answer» B. 109.5 | |
| 93. |
The heat change for the reaction, C(s) + 2S(s) → CS2(l), is 104.2 kJ. It represents the heat of |
| A. | formation |
| B. | solution |
| C. | combustion |
| D. | fusion |
| Answer» B. solution | |
| 94. |
The heat evolved in the combustion of benzene is represented by the equation: C6H6 + 7.5 O2 = 6CO2 + 3H2O, ΔH = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C6H6 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 | |
| 95. |
At standard conditions, N2 + 2O2 2NO2; ΔG° = 100 kJ/moleNO + O2 2NO2; ΔG° = -35 kJ/moleThe standard free energy of formation of NO in kJ/mole is |
| A. | 15 |
| B. | 30 |
| C. | 85 |
| D. | 170 |
| Answer» D. 170 | |
| 96. |
A vessel of volume 1000 m3 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 | |
| 97. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 → CO2 + 2H2O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about |
| A. | 0.19 |
| B. | 0.33 |
| C. | 0.4 |
| D. | 0.67 |
| Answer» B. 0.33 | |
| 98. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 → CO2 + 2H2O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in °C would be approximately equal to |
| A. | 1225 |
| B. | 1335 |
| C. | 1525 |
| D. | 1735 |
| Answer» E. | |
| 99. |
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/m3 . The diffusivity of aniline in air is 0.74xl0-5m2/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/cm2. s |
| C. | mole/m2 . s |
| D. | kmole/m2 . s |
| Answer» E. | |
| 100. |
One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98°C ; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The amount of water vapour condensed (in kg) is |
| A. | 0 |
| B. | 0.065 |
| C. | 0.1 |
| D. | 1 |
| Answer» C. 0.1 | |