MCQOPTIONS
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MCQOPTIONS
This section includes 332 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. |
The reaction A + B → C has been conducted in a reactor as shown below. The numbers of balances (material) that can be made around the reactor are________________? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 52. |
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. | |
| 53. |
The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the_____________________? |
| A. | Relative humidity |
| B. | Relative saturation |
| C. | Percentage saturation |
| D. | None of these |
| Answer» D. None of these | |
| 54. |
The rate of material _____________ is zero in case of a steady state system? |
| A. | Accumulation |
| B. | Production |
| C. | Input |
| D. | Generation |
| Answer» B. Production | |
| 55. |
The quantity of heat required to evaporate 1 kg of a saturated liquid is called __________________? |
| A. | Specific heat |
| B. | 1 Kcal |
| C. | Sensible heat |
| D. | Latent heat |
| Answer» E. | |
| 56. |
The pressure of ‘V’ litres of a dry gas is increased from 1 to 2 kgf/cm2 at a constant temperature. The new volume will become___________________? |
| A. | V/2 |
| B. | 2V |
| C. | V/4 |
| D. | V2 |
| Answer» B. 2V | |
| 57. |
The pH 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 | |
| 58. |
The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is_____________________? |
| A. | Termed as relative saturation |
| B. | Not a function of the composition of gas mixture |
| C. | Called percentage saturation |
| D. | Not a function of the nature of vapor |
| Answer» B. Not a function of the composition of gas mixture | |
| 59. |
The osmotic pressure of a solution increases, if its _____________ is decreased? |
| A. | Volume |
| B. | Solute concentration |
| C. | Temperature |
| D. | None of these |
| Answer» E. | |
| 60. |
The OH- concentration in a solution having pH value 3 is____________________? |
| A. | 10-3 |
| B. | 10-10 |
| C. | 10-11 |
| D. | 10-13 |
| Answer» D. 10-13 | |
| 61. |
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» D. 1019 | |
| 62. |
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 |
| Answer» D. 1013 | |
| 63. |
The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are__________________? |
| A. | 3.01 × 1022 |
| B. | 6.02 × 1023 |
| C. | 9.03 × 1024 |
| D. | 1.20 × 1024 |
| Answer» D. 1.20 × 1024 | |
| 64. |
The most convenient way of expressing solution concentration is in terms of___________________? |
| A. | Mole fraction |
| B. | Normality |
| C. | Molality |
| D. | Molarity |
| Answer» E. | |
| 65. |
The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal _____________ in the two phases? |
| A. | Potential energy |
| B. | Intermolecular forces |
| C. | Kinetic energy |
| D. | Total energy |
| Answer» D. Total energy | |
| 66. |
The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas)? |
| A. | √T |
| B. | T |
| C. | T2 |
| D. | 1/√T |
| Answer» B. T | |
| 67. |
The molar composition of a gas is 10% H2, 10% O2, 30% CO2 and balance H2O. If 50% H2O condenses, the final mole percent of H2 in the gas on a dry basis will be_______________? |
| A. | 10% |
| B. | 5% |
| C. | 18.18% |
| D. | 20% |
| Answer» E. | |
| 68. |
The maximum adiabatic flame temperature of fuels in air is ____________ the maximum flame temperature in pure oxygen? |
| A. | Lower than |
| B. | Higher than |
| C. | Same as |
| D. | Not related to |
| Answer» B. Higher than | |
| 69. |
The latent heat of vaporisation__________________? |
| A. | Decreases with increased temperature |
| B. | Decreases as pressure increases |
| C. | Becomes zero at the critical point |
| D. | All A., B. & C. |
| Answer» E. | |
| 70. |
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 |
| Answer» D. Molality | |
| 71. |
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 | |
| 72. |
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» B. CS2 > C2H5OH > H2O | |
| 73. |
The heat of solution depends upon the____________________? |
| A. | Nature of solvent |
| B. | Concentration of solution |
| C. | Nature of solute |
| D. | All A., B. & C. |
| Answer» E. | |
| 74. |
The heat of adsorption of a gas caused by Van der Waals forces of attraction and capillarity is equal to the heat of__________________? |
| A. | Normal condensation |
| B. | Wetting |
| C. | Sum of A. and B. |
| D. | Difference of A. and B. |
| Answer» D. Difference of A. and B. | |
| 75. |
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 | |
| 76. |
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 | |
| 77. |
The heat capacity of most substances is greater for the _______________ state? |
| A. | Solid |
| B. | Liquid |
| C. | Gaseous |
| D. | None of these |
| Answer» C. Gaseous | |
| 78. |
The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the___________________? |
| A. | Trouton’s rule |
| B. | Kopp’s rule |
| C. | Antoine equation |
| D. | Kistyakowsky equation |
| Answer» C. Antoine equation | |
| 79. |
The heat capacity of a substance is ____________________? |
| A. | Greater for liquid state than for solid state |
| B. | Lower for liquid state than for gaseous state |
| C. | Higher for solid state than for liquid state |
| D. | Equal for solid and liquid states below melting point |
| Answer» B. Lower for liquid state than for gaseous state | |
| 80. |
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» E. | |
| 81. |
The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________? |
| A. | Increases with pressure rise |
| B. | Decreases with increasing pressure |
| C. | Becomes zero at the critical point |
| D. | Both B. & C. |
| Answer» E. | |
| 82. |
The evaporation of aqueous solution of sugar causes its molarity to__________________? |
| A. | Decrease |
| B. | Increase |
| C. | Remain unchanged |
| D. | Either A. or B.; depends on the concentration of the solution |
| Answer» D. Either A. or B.; depends on the concentration of the solution | |
| 83. |
“The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law? |
| A. | Raoult’s |
| B. | Henry’s |
| C. | Amagat’s |
| D. | None of these |
| Answer» C. Amagat’s | |
| 84. |
The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is ____________________? |
| A. | 15.5 |
| B. | 16 |
| C. | 16.5 |
| D. | 17 |
| Answer» D. 17 | |
| 85. |
The equilibria relations in a multi-component and multiphase system cannot be calculated with the help of the_______________? |
| A. | Phase rule |
| B. | Experimental data |
| C. | Empirical equations |
| D. | Theoretical equations |
| Answer» B. Experimental data | |
| 86. |
The elevation in boiling point of a solution is proportional to the ______________ of the solution? |
| A. | Molal concentration |
| B. | Reciprocal of the molal concentration |
| C. | Normality |
| D. | Molarity |
| Answer» B. Reciprocal of the molal concentration | |
| 87. |
The effect of pressure on the heat capacity of the gases ______________ is negligible? |
| A. | At pressure below one atmosphere |
| B. | Below the critical temperature |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 88. |
The depression in freezing point of a solution is________________? |
| A. | Inversely proportional to the mass of solvent |
| B. | Directly proportional to the mole of solute |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 89. |
The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to________________? |
| A. | 1.5 |
| B. | 15 |
| C. | 150 |
| D. | 1500 |
| Answer» E. | |
| 90. |
The density of a gas ‘X’ is twice that of another gas ‘Y’. If the molecular weight of gas ‘Y’ is ‘M’; then the molecular weight of the gas ‘X’ will be________________? |
| A. | 2M |
| B. | M/2 |
| C. | M |
| D. | M/4 |
| Answer» B. M/2 | |
| 91. |
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 ¾ 0.75 ρ at a temperature of ____________ °K? |
| A. | 273° |
| B. | 300° |
| C. | 400° |
| D. | 373° |
| Answer» D. 373° | |
| 92. |
The crystallisation of a solute from a solution may be done by________________? |
| A. | Removal of pure solvent by evaporation |
| B. | Change of temperature thereby causing super-saturation |
| C. | Changing the nature of the system by the addition of a more soluble material |
| D. | All A., B. & C. |
| Answer» E. | |
| 93. |
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 |
| Answer» B. +109.5 | |
| 94. |
The chemical nature of an element is independent of_______________________? |
| A. | Its atomic number |
| B. | The number of protons or electrons present in it |
| C. | The number of neutrons present in it |
| D. | None of these |
| Answer» D. None of these | |
| 95. |
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 | |
| 96. |
The average translational kinetic energy with which a gas molecule is endowed is dependent on its__________________? |
| A. | Nature |
| B. | Size |
| C. | Absolute temperature |
| D. | All A., B. & C. |
| Answer» D. All A., B. & C. | |
| 97. |
The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be _____________ times? |
| A. | 1/2 |
| B. | 4 |
| C. | √2 |
| D. | 1/4 |
| Answer» D. 1/4 | |
| 98. |
The atomic heat capacities of all solid elements ______________ with decrease in temperature? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Approach zero at 0°C |
| Answer» C. Remains unchanged | |
| 99. |
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» C. 6.5 | |
| 100. |
The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________? |
| A. | Measures the elevation in boiling point |
| B. | Is not dependent on the temperature |
| C. | Is a function of the liquid phase composition |
| D. | Measures the depression in freezing point |
| Answer» D. Measures the depression in freezing point | |