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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.
| 551. |
At a temperature of 0°K, the molecules of a gas have only __________ energy.$ |
| A. | rotational |
| B. | vibrational |
| C. | translational |
| D. | none of these |
| Answer» D. none of these | |
| 552. |
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 |
| A. | decrease in mean free path. |
| B. | increased collision rate among molecules. |
| C. | increase in molecular attraction. |
| D. | increase in average molecular speed. |
| Answer» D. increase in average molecular speed. | |
| 553. |
The unit of dynamic viscosity is |
| A. | stoke |
| B. | poise |
| C. | gm/cm sec. |
| D. | both (b) & (c) |
| Answer» E. | |
| 554. |
pH value of an alkaline solution is |
| A. | 7 |
| B. | > 7 |
| C. | < 7 |
| D. | constant over a wide range |
| Answer» C. < 7 | |
| 555. |
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 | |
| 556. |
Which of the following expressions defines the Baume gravity scale for liquids lighter than water ? |
| A. | °Be = (140/G) - 130 |
| B. | °Be = 200(G-1) |
| C. | °Be = 145 - (145/G) |
| D. | °Be = (400/G) - 400 |
| Answer» B. ¬∞Be = 200(G-1) | |
| 557. |
Which of the following has the smallest least effect on the solubility of a solute into the solvent ? |
| A. | Nature of the solute |
| B. | Nature of the solvent |
| C. | Temperature |
| D. | Pressure |
| Answer» E. | |
| 558. |
Internal energy is independent of the __________ for an ideal gas. |
| A. | pressure |
| B. | volume |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 559. |
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. | |
| 560. |
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. | Antonie equation |
| D. | Kistyakowsky equation |
| Answer» C. Antonie equation | |
| 561. |
The temperature of a gas in a closed container is 27° C. If the temperature of the gas is incresed to 300° C, then the pressure exerted is$ |
| A. | doubled. |
| B. | halved. |
| C. | trebled. |
| D. | unpredictable. |
| Answer» E. | |
| 562. |
The total number of atoms in 8.5 gm of NH3 is __________ x 1023. |
| A. | 9.03 |
| B. | 3.01 |
| C. | 1.204 |
| D. | 6.02 |
| Answer» B. 3.01 | |
| 563. |
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 | |
| 564. |
For an endothermic reaction, the minimum value of energy of activation will be (where, ΔH = enthalpy of the reaction)$ |
| A. | Δ H |
| B. | >ΔH |
| C. | <ΔH |
| D. | 0 |
| Answer» C. <ŒîH | |
| 565. |
Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the |
| A. | same elevation in boiling point. |
| B. | different elevation in boiling point. |
| C. | elevation in boiling point in the ratio of their molecular weights. |
| D. | none of these. |
| Answer» B. different elevation in boiling point. | |
| 566. |
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 | |
| 567. |
Total energy at a point comprises of __________ energy. |
| A. | potential & kinetic |
| B. | pressure |
| C. | internal |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 568. |
A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to |
| A. | x1/x2 |
| B. | x2/x1 |
| C. | 1 - (x1/x2) |
| D. | 1/x2 |
| Answer» B. x2/x1 | |
| 569. |
The heat change for the reaction, C(s) + 2S(s) ‚Üí CS2(l), is 104.2 kJ. It represents the heat of$ |
| A. | formation |
| B. | solution |
| C. | combustion |
| D. | fusion |
| Answer» B. solution | |
| 570. |
Number of gm moles of solute dissolved in 1 kg of solvent is called its |
| A. | normality |
| B. | molarity |
| C. | molality |
| D. | formality |
| Answer» D. formality | |
| 571. |
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 | |
| 572. |
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. | |
| 573. |
If 1 Nm3 of O2 contains 'N' number of molecules, then number of molecules in 2Nm3 of SO2 will be |
| A. | N |
| B. | N/2 |
| C. | 2N |
| D. | 4N |
| Answer» D. 4N | |
| 574. |
Pick out the wrong unit conversion. |
| A. | 1 Joule = 4.186 calorie. |
| B. | 1 kcal = 3.968 BTU = 0.00116 kWh = 0.00156 hp. |
| C. | 1 ton of TNT (tri-nitro-toluene) = 4.2 GJ (1G = 109). |
| D. | 1 ft.lbf= 0.3238 calorie = 0.1383 kg.m = 1.356 J = 1.356 N.m. |
| Answer» B. 1 kcal = 3.968 BTU = 0.00116 kWh = 0.00156 hp. | |
| 575. |
For a reacation, X ‚Üí Y, if the concentration of 'X' is tripled; the rate becomes nine times. The order of reaction is$ |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 576. |
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 supersaturation. |
| C. | changing the nature of the system by the addition of a more soluble material. |
| D. | all (a), (b) &(c). |
| Answer» E. | |
| 577. |
In physical adsorption, as compared to chemisorption, the |
| A. | quantity adsorbed per unit mass is higher. |
| B. | rate of adsorption is controlled by the resistance to surface reaction. |
| C. | activation energy is very high. |
| D. | heat of adsorption is very large. |
| Answer» B. rate of adsorption is controlled by the resistance to surface reaction. | |
| 578. |
In a chemical process, the recycle stream is purged for |
| A. | increasing the product yield. |
| B. | enriching the product. |
| C. | limiting the inerts. |
| D. | heat conservation. |
| Answer» D. heat conservation. | |
| 579. |
In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the |
| A. | total pressure. |
| B. | absolute humidity at a given temperature. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 580. |
The heat of adsorption of a gas caused by Van der Walls 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). | |
| 581. |
Ideal solution is formed, when its components have zero |
| A. | heat of mixing. |
| B. | volume change. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 582. |
If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is __________ times. |
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 10000 |
| Answer» D. 10000 | |
| 583. |
If 1.5 moles of oxygen combines with aluminium to form Al2O3, then the weight of aluminium (atomic weight = 27 ) used in this reaction is __________ gm. |
| A. | 27 |
| B. | 54 |
| C. | 5.4 |
| D. | 2.7 |
| Answer» C. 5.4 | |
| 584. |
In the reaction, represented by Na2CO3 + HC1 ‚Üí NaHO3 + NaCl, the equivalent weight of Na2CO3 is$ |
| A. | 53 |
| B. | 5.3 |
| C. | 106 |
| D. | 10.6 |
| Answer» D. 10.6 | |
| 585. |
Measurement of the amount of dry gas collected over water from volume of moist gas is based on the |
| A. | Charle's law. |
| B. | Dalton's law of partial pressures. |
| C. | Avogadro's hypothesis. |
| D. | Boyle's law. |
| Answer» C. Avogadro's hypothesis. | |
| 586. |
Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp 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 | |
| 587. |
The number of H+ in 1 c.c solution of pH 13 is |
| A. | 6.023 xl013 |
| B. | 6.023 x 1010 |
| C. | 6.023xl07 |
| D. | 1013 |
| Answer» D. 1013 | |
| 588. |
A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) |
| A. | 350 |
| B. | 485 |
| C. | 140 |
| D. | 345 |
| Answer» B. 485 | |
| 589. |
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. | 0.1 |
| B. | 0.05 |
| C. | 0.1818 |
| D. | 0.2 |
| Answer» E. | |
| 590. |
Kopp's rule is helpful in finding the |
| A. | heat capacities of solids. |
| B. | heat capacities of gases. |
| C. | molal heat capacities of gases. |
| D. | activation energy. |
| Answer» B. heat capacities of gases. | |
| 591. |
__________ equation gives the effect of temperature on heat of reaction. |
| A. | Kirchoffs |
| B. | Maxwell's |
| C. | Antonie |
| D. | Kistyakowsky |
| Answer» B. Maxwell's | |
| 592. |
With rise in pressure, the solubility of gases in solvent, at a fixed temperature |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | decreases linearly |
| Answer» B. decreases | |
| 593. |
Pick out the wrong unit conversion of temperature. |
| A. | °R = 273 + °F |
| B. | temperature difference of 1°K = 1°C = °F |
| C. | °C = (F- 32) x 0.555 |
| D. | °F = (°C + 17.778) x 1.8 |
| Answer» B. temperature difference of 1¬∞K = 1¬∞C = ¬∞F | |
| 594. |
A sugar solution containing __________ percent sugar is equivalent to 1 Brix. |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| Answer» D. 10 | |
| 595. |
Compressibility factor of a real gas is the ratio of the actual volume to that predicted by ideal gas law. As the pressure of the gas approaches zero, the compressibility factor approaches |
| A. | ‚àû |
| B. | 0 |
| C. | 1 |
| D. | 0.24 |
| Answer» D. 0.24 | |
| 596. |
With rise in temperature, the solubility of ammonia in water at a fixed pressure |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | increases exponentially |
| Answer» C. remains unchanged | |
| 597. |
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. | |
| 598. |
N2 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. | 0.8 |
| B. | 0.9 |
| C. | 0.95 |
| D. | 0.98 |
| Answer» C. 0.95 | |
| 599. |
Addition of a non-volatile solute to a solvent produces a __________ in its solvent. |
| A. | freezing point elevation |
| B. | boiling point depression |
| C. | vapor pressure lowering |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 600. |
6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be __________ gm. |
| A. | 0.5 |
| B. | 1 |
| C. | 3 |
| D. | 5 |
| Answer» B. 1 | |