MCQOPTIONS
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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.
| 601. |
Kopp's rule is concerned with the calculation of |
| A. | thermal conductivity. |
| B. | heat capacity. |
| C. | viscosity. |
| D. | surface tension. |
| Answer» C. viscosity. | |
| 602. |
80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is |
| A. | 0 |
| B. | 0.18 |
| C. | 0.24 |
| D. | 1 |
| Answer» C. 0.24 | |
| 603. |
Disappearance of snow in subzero weather exemplifies the process of |
| A. | evaporation |
| B. | sublimation |
| C. | vaporisation |
| D. | melting |
| Answer» C. vaporisation | |
| 604. |
Which of the following is an exothermic reaction ? |
| A. | Conversion of graphite to diamond |
| B. | Decomposition of water |
| C. | Dehydrogenation of ethane to ethylene |
| D. | none of these |
| Answer» E. | |
| 605. |
Recycling in a chemical process facilitates |
| A. | increased yield |
| B. | enrichment of product |
| C. | heat conservation |
| D. | all (a), (b) &(c) |
| Answer» E. | |
| 606. |
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. | |
| 607. |
If pH value of a solution is 8, then its pOH value will be |
| A. | 6 |
| B. | 1 |
| C. | 7 |
| D. | 10 |
| Answer» B. 1 | |
| 608. |
Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules |
| A. | do not lose energy on collision. |
| B. | are above the inversion temperature. |
| C. | do not exert attractive force on each other. |
| D. | do work equal to loss in kinetic energy. |
| Answer» D. do work equal to loss in kinetic energy. | |
| 609. |
1 bar is almost equal to __________ atmosphere. |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 10 | |
| 610. |
The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the |
| A. | temperature & pressure. |
| B. | number of intermediate chemical reactions involved. |
| C. | state of aggregation & the state of combination at the beginning & the end of the reaction. |
| D. | none of these. |
| Answer» C. state of aggregation & the state of combination at the beginning & the end of the reaction. | |
| 611. |
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 | |
| 612. |
Density of carbon dioxide is __________ kg/Nm3. |
| A. | 44/22400 |
| B. | 44/22.4 |
| C. | 22.4/44 |
| D. | none of these |
| Answer» C. 22.4/44 | |
| 613. |
A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the |
| A. | atomic weight of the metal is 4. |
| B. | equivalent weight of the metal is 4. |
| C. | atomic weight of the metal is 2. |
| D. | equivalent weight of the metal is 8. |
| Answer» C. atomic weight of the metal is 2. | |
| 614. |
In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality? |
| A. | Use of equation of state |
| B. | Fugacity co-efficient |
| C. | Activity co-efficient |
| D. | None of these |
| Answer» D. None of these | |
| 615. |
Increasing the temperature of an aqueous solution will cause decrease in its |
| A. | molality |
| B. | mole fraction |
| C. | weight percent |
| D. | molarity |
| Answer» E. | |
| 616. |
A 'limiting reactant' is the one, which decides the __________ in the chemical reacation. |
| A. | equilibrium constant |
| B. | conversion |
| C. | rate constant |
| D. | none of these |
| Answer» C. rate constant | |
| 617. |
Heat of reaction is not influenced by |
| A. | the route/method through which final products are obtained. |
| B. | the physical state (e.g., solid, liquid or gaseous) of reactants and products. |
| C. | whether the reaction is carried out at constant temperature or constant pressure. |
| D. | none of these. |
| Answer» B. the physical state (e.g., solid, liquid or gaseous) of reactants and products. | |
| 618. |
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. | |
| 619. |
The reverse process of fractional crystallisation is called |
| A. | stripping |
| B. | leaching |
| C. | differential distillation |
| D. | absorption |
| Answer» C. differential distillation | |
| 620. |
The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies |
| A. | XM < 0.5 |
| B. | XM = 0.5 |
| C. | 0.5 < XM < 0.64 |
| D. | XM ‚â• 0.64 |
| Answer» E. | |
| 621. |
Size range of the colloidals particles is |
| A. | 5 - 200 milli-microns |
| B. | 50 - 200 microns |
| C. | 500 - 1000 microns |
| D. | 10 - 50 Angstrom |
| Answer» B. 50 - 200 microns | |
| 622. |
Cv for monoatomic gases is equal to(where, R = gas constant) |
| A. | R |
| B. | 1.5 R |
| C. | 2R |
| D. | 3R |
| Answer» C. 2R | |
| 623. |
Vapor pressure of a solution is proportional to(where, Sv and St are mole fraction of solvent and solute respectively). |
| A. | Sv |
| B. | 1/St |
| C. | St |
| D. | 1/Sv |
| Answer» B. 1/St | |
| 624. |
With increase in the solute concentration, the specific heat of aqueous solutions |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | either (a) or (b); depends on the type of solution |
| Answer» C. remains unchanged | |
| 625. |
On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes |
| A. | 1 |
| B. | 8 |
| C. | 4 |
| D. | 2 |
| Answer» D. 2 | |
| 626. |
The rate of material __________ is zero in case of a steady state system. |
| A. | accumulation |
| B. | production |
| C. | input |
| D. | generation |
| Answer» B. production | |
| 627. |
1 BTU/ft3 is approximately equal to __________ kcal/m3. |
| A. | 1 |
| B. | 9 |
| C. | 4 |
| D. | 252 |
| Answer» C. 4 | |
| 628. |
How many phases are present at eutectic point ? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 629. |
One micron is equal to |
| A. | 10-4 mm |
| B. | 10-4 cm |
| C. | 10-6 m |
| D. | both(b)&(c) |
| Answer» E. | |
| 630. |
In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the |
| A. | solute concentration |
| B. | temperature |
| C. | both(a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 631. |
Sodium __________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature. |
| A. | carbonate (monohydrate) |
| B. | chloride |
| C. | thiosulphate |
| D. | bisulphite |
| Answer» B. chloride | |
| 632. |
Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult's law is proportional to the |
| A. | temperature. |
| B. | volume of solution. |
| C. | moles of non-volatile solute. |
| D. | none of these. |
| Answer» B. volume of solution. | |
| 633. |
Weight of 56 litres of ammonia at N.T.P. is __________ gm. |
| A. | 2.5 |
| B. | 42.5 |
| C. | 56 |
| D. | 2800 |
| Answer» C. 56 | |
| 634. |
Raoult's law is not applicable to the |
| A. | solutes which dissociate or associate in the particular solution. |
| B. | concentrated solutions. |
| C. | both(b)&(c) |
| D. | solutions containing non-volatile solute. |
| Answer» D. solutions containing non-volatile solute. | |
| 635. |
A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal |
| A. | kinetic energy. |
| B. | intermolecular forces of attraction. |
| C. | potential energy. |
| D. | total energy. |
| Answer» B. intermolecular forces of attraction. | |
| 636. |
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. Its units are |
| A. | m/s |
| B. | cm/s |
| C. | mole/m2.s.Pa |
| D. | kmole/m2.s.Pa |
| Answer» D. kmole/m2.s.Pa | |
| 637. |
Na2SO4. 10H2O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na2SO4. The final concentration of the solute in the solution is 10%. The weight of crystals is |
| A. | 20 |
| B. | 32.2 |
| C. | 45.35 |
| D. | 58.65 |
| Answer» E. | |
| 638. |
Which of the following gases is the most soluble in water ? |
| A. | NH3 |
| B. | CO2 |
| C. | H2S |
| D. | CH4 |
| Answer» B. CO2 | |
| 639. |
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 Xc and Xs respectively. Which of the following statement is correct ? |
| A. | Xc > Xs |
| B. | Xc = Xs . |
| C. | Xc < Xs |
| D. | Xc greater/less than Xs depending on the length of the cylinder |
| Answer» D. Xc greater/less than Xs depending on the length of the cylinder | |
| 640. |
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» C. 1 BTU/ft2.hr = 2.712 kcal/m2.hr. | |
| 641. |
In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is |
| A. | independent of the temperature. |
| B. | increased with the increase in pressure. |
| C. | decreased with the increase in pressure. |
| D. | unchanged by the pressure change. |
| Answer» D. unchanged by the pressure change. | |
| 642. |
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 | |
| 643. |
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 | |
| 644. |
In a binary liquid solution of components A and B, if component A exhibits positive deviation from Raoult's law, then component B |
| A. | exhibits positive deviation from Raoult's law. |
| B. | exhibits negative deviation from Raoult's law. |
| C. | obeys Raoult's law. |
| D. | may exhibit either positive or negative deviation from Raoult's law. |
| Answer» B. exhibits negative deviation from Raoult's law. | |
| 645. |
Which equation is not an equation of state ? |
| A. | PV = RT + B/V + y/V2 + .... |
| B. | (P + a/V2)(V-b) = RT |
| C. | |
| D. | |
| Answer» D. | |
| 646. |
Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is |
| A. | 43709 |
| B. | 43716 |
| C. | 43497 |
| D. | 43713 |
| Answer» C. 43497 | |
| 647. |
Pick out the wrong unit conversion of calorific value. |
| A. | 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg. |
| B. | 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3. |
| C. | 1 BTU/lb = 2.3 kcal/kg. |
| D. | 1 kcal/m3 = 0.1124 BTU/ft3. |
| Answer» D. 1 kcal/m3 = 0.1124 BTU/ft3. | |
| 648. |
Volume percent for gases is equal to the |
| A. | weight percent. |
| B. | mole percent. |
| C. | weight percent only for ideal gases. |
| D. | mole percent only for ideal gases. |
| Answer» E. | |
| 649. |
An ideal gas can be liquified, because |
| A. | its molecular size is very small. |
| B. | its critical temperature is more than 0°C. |
| C. | forces operative between its molecules are negligible. |
| D. | it gets solidified directly without becoming liquid. |
| Answer» D. it gets solidified directly without becoming liquid. | |
| 650. |
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 | |