MCQOPTIONS
Saved Bookmarks
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.
| 1. |
The vapor pressure of liquids of similar chemical nature at any particular temperature __________ with increase in the molecular weight. |
| A. | decreases |
| B. | increases |
| C. | either ( or (; depends on the liquid |
| D. | remains unchanged |
| Answer» B. increases | |
| 2. |
A \'limiting reactant\' is the one, which decides the __________ in the chemical reacation. |
| A. | conversion |
| B. | equilibrium constant |
| C. | none of these |
| D. | rate constant |
| Answer» B. equilibrium constant | |
| 3. |
__________ is an intensive property. |
| A. | Refractive index |
| B. | Temperature |
| C. | none of these |
| D. | Volume |
| Answer» D. Volume | |
| 4. |
The heat change for the reaction, C(s) 2S(s) → CS2(l), is 104.2 kJ. It represents the heat of |
| A. | solution |
| B. | formation |
| C. | fusion |
| D. | combustion |
| Answer» C. fusion | |
| 5. |
Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the \'corresponding states\'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly |
| A. | molecular weight |
| B. | compressibility |
| C. | none of these |
| D. | humidity |
| Answer» C. none of these | |
| 6. |
Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm. |
| A. | 2 |
| B. | 1 |
| C. | 4 |
| D. | 3 |
| Answer» B. 1 | |
| 7. |
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. | 16.15 kJ |
| B. | 10.73 kJ |
| C. | 18.33 kJ |
| D. | 18.11 kJ |
| Answer» E. | |
| 8. |
In the reaction, Ca 2H2O = Ca(OH)2 H2 ; 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. | 2240 |
| B. | 4480 |
| C. | 0.4 |
| D. | 1120 |
| Answer» C. 0.4 | |
| 9. |
A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be |
| A. | -136.5°C |
| B. | - 136.5°K |
| C. | -273°C |
| D. | 0°K |
| Answer» B. - 136.5°K | |
| 10. |
An equation for calculating vapour pressure is given by, log 10 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 | |
| 11. |
1 kg/m 2 is equal to __________ mm water column. |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 10 | |
| 12. |
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 | |
| 13. |
Giga' stands for |
| A. | 10 9 |
| B. | 10 -12 |
| C. | 10 12 |
| D. | 10 15 |
| Answer» B. 10 -12 | |
| 14. |
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 3 . 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 3 . The latent heat of condensation (kJ/kg -1 ) under these conditions is |
| A. | 40732 |
| B. | 2676 |
| C. | 2263 |
| D. | 540 |
| Answer» D. 540 | |
| 15. |
For a given mass of a gas at constant temperature, if the volume ' V ' becomes three times, then the pressure ' P ' will become |
| A. | P /3 |
| B. | 3 P |
| C. | 9 P 2 |
| D. | 9 P |
| Answer» B. 3 P | |
| 16. |
1 kg/cm 2 is equal to |
| A. | 760 torr |
| B. | 1KPa |
| C. | 10 metres of water column |
| D. | 1 metre of water column |
| Answer» D. 1 metre of water column | |
| 17. |
What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100°C, if their vapor pressures at 100°C are 1340, 560 and 210 mmHg respectively ? |
| A. | 756.2 |
| B. | 780.5 |
| C. | 801.5 |
| D. | 880.5 |
| Answer» D. 880.5 | |
| 18. |
C p is expressed in S.I. unit as |
| A. | J/kg.°K |
| B. | 0°K |
| C. | W/m 2 . °C |
| D. | W/m. °K |
| Answer» B. 0°K | |
| 19. |
1 BTU/ft 3 is approximately equal to __________ kcal/m 3 . |
| A. | 1 |
| B. | 9 |
| C. | 4 |
| D. | 252 |
| Answer» C. 4 | |
| 20. |
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 | |
| 21. |
Enthalpy of formation of NH 3 is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH 3 ? N 2 + 3H 2 , is equal to __________ kJ/kg. mole. |
| A. | 46 |
| B. | 92 |
| C. | -23 |
| D. | -92 |
| Answer» C. -23 | |
| 22. |
__________ kg of CaC0 3 on heating will give 56 kg of CaO. |
| A. | 56 . |
| B. | 100 |
| C. | 144 |
| D. | 1000 |
| Answer» C. 144 | |
| 23. |
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. | |
| 24. |
1 gm mole of methane (CH 4 ) contains |
| A. | 6.02 x 10 23 atoms of hydrogen. |
| B. | 4 gm atoms of hydrogen. |
| C. | 3.01 x 10 23 molecules of methane. |
| D. | 3 gms of carbon. |
| Answer» C. 3.01 x 10 23 molecules of methane. | |
| 25. |
The value of gas constant ' R ' is __________ kcal/kg.mole.°C. |
| A. | 2.79 |
| B. | 1.987 |
| C. | 3.99 |
| D. | none of these |
| Answer» E. | |
| 26. |
Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is |
| A. | 80.1°C. |
| B. | less than 80.1°C. |
| C. | 100°C. |
| D. | greater than 80.1°C but less than 100°C. |
| Answer» E. | |
| 27. |
Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ? H = heat of mixing, and ? V = volume change on mixing ) ? |
| A. | ? H = 1 (+ ve )and ? V = - ve |
| B. | ? H = 0 |
| C. | ? V = 0 |
| D. | both (b) and (c) |
| Answer» E. | |
| 28. |
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 3 . 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 3 . The amount of water vapour condensed (in kg) is |
| A. | 0.0 |
| B. | 0.065 |
| C. | 0.1 |
| D. | 1.0 |
| Answer» C. 0.1 | |
| 29. |
°API gravity of water at N.T.P. is about |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| Answer» D. 100 | |
| 30. |
Two solutions A 1 and A 2 have pH value of 2 and 6 respectively. It implies that the solution |
| A. | A 2 is more alkaline than solution A 2 |
| B. | A 1 is highly acidic. |
| C. | A 1 is very slightly acidic. |
| D. | both (a) &(c). |
| Answer» E. | |
| 31. |
The unit of specific heat at constant pressure, C p , in SI unit is |
| A. | W/m 2 °C |
| B. | J/kg°K |
| C. | W/m°K |
| D. | J/m 3 °K |
| Answer» C. W/m°K | |
| 32. |
C p / C v for monoatomic gases is |
| A. | 1.44 |
| B. | 1.66 |
| C. | 1.99 |
| D. | 1 |
| Answer» C. 1.99 | |
| 33. |
The density of a liquid is 1500 kg/m 3 . Its value in gin/litre will be equal to |
| A. | 1.5 |
| B. | 15 |
| C. | 150 |
| D. | 1500 |
| Answer» E. | |
| 34. |
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 | |
| 35. |
Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the |
| A. | temperature vs. log (vapor pressure). |
| B. | vapor pressure vs. log (temperature). |
| C. | log (temperature) vs. log (vapor pressure). |
| D. | vapor pressure vs. temperature. |
| Answer» B. vapor pressure vs. log (temperature). | |
| 36. |
A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be __________ c.c. |
| A. | 283 |
| B. | 566 |
| C. | 293 |
| D. | 141.5 |
| Answer» D. 141.5 | |
| 37. |
If 1.5 moles of oxygen combines with aluminium to form Al 2 O 3 , 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 | |
| 38. |
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 . Its units are |
| A. | m/s |
| B. | cm/s |
| C. | mole/m 2 .s.Pa |
| D. | kmole/m 2 .s.Pa |
| Answer» D. kmole/m 2 .s.Pa | |
| 39. |
The heats of vaporisation of CS 2 , C 2 H 5 OH &H 2 O are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is |
| A. | H 2 O > C 2 H 5 OH > CS 2 |
| B. | CS 2 > C 2 H 5 OH > H 2 O |
| C. | H 2 O > CS 2 > C 2 H 5 OH |
| D. | CS 2 > H 2 O > C 2 H 5 OH |
| Answer» B. CS 2 > C 2 H 5 OH > H 2 O | |
| 40. |
The total number of atoms in 8.5 gm of NH 3 is __________ x 10 23 . |
| A. | 9.03 |
| B. | 3.01 |
| C. | 1.204 |
| D. | 6.02 |
| Answer» B. 3.01 | |
| 41. |
Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0°C will be __________ atmosphere. |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» C. 1.5 | |
| 42. |
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 = m X 2 for the above data is |
| A. | 15.5 |
| B. | 16 |
| C. | 16.5 |
| D. | 17 |
| Answer» D. 17 | |
| 43. |
Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is x B and the vapour pressures of benzene and water at these conditions are p v B and p v w respectively. The partial pressure of benzene in air-vapour mixture is |
| A. | P v B |
| B. | x B . P v B |
| C. | ( P atm - P v w ) x B |
| D. | x B . P atm |
| Answer» C. ( P atm - P v w ) x B | |
| 44. |
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. 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. | |
| 45. |
Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity ? Vapour pressure of water at 20°C is 17.5 mm Hg. |
| A. | 80.38 |
| B. | 80 |
| C. | 79.62 |
| D. | 78.51 |
| Answer» D. 78.51 | |
| 46. |
On mixing 56 gm of CaO with 63 gm of HNO 3 , the amount of Ca(NO 3 ) 2 formed is __________ gm. |
| A. | 82 |
| B. | 164 |
| C. | 41 |
| D. | 8.2 |
| Answer» B. 164 | |
| 47. |
What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C ? |
| A. | 2/3 |
| B. | 1/3 |
| C. | 1/2 |
| D. | l/3 x |
| Answer» C. 1/2 | |
| 48. |
Na 2 SO 4 . 10H 2 O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na 2 SO 4 . 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. | |
| 49. |
If 1 Nm 3 of O 2 contains 'N' number of molecules, then number of molecules in 2Nm 3 of SO 2 will be |
| A. | N |
| B. | N/2 |
| C. | 2N |
| D. | 4N |
| Answer» D. 4N | |
| 50. |
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 | |