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.
| 1. |
1 kgf/cm is not equal to |
| A. | 1 torr |
| B. | 1 bar |
| C. | 10000 mm wc |
| D. | 100 KPa = 100 000 N/m |
| Answer» B. 1 bar | |
| 2. |
The heat change for the reaction, C(s) + 2S(s) → CS(l), is 104.2 kJ. It represents the heat of |
| A. | formation |
| B. | solution |
| C. | combustion |
| D. | fusion |
| Answer» B. solution | |
| 3. |
A sample of well water contains 140 gm/m Ca ions and 345 gm/m Naions. The hardness of the sample of water, expressed in terms of equivalent CaCO in gm/m is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) |
| A. | 350 |
| B. | 485 |
| C. | 140 |
| D. | 345 |
| Answer» B. 485 | |
| 4. |
The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol satisfies |
| A. | < 0.5 |
| B. | = 0.5 |
| C. | 0.5 < |
| D. | < 0.64 |
| E. | ≥ 0.64 |
| Answer» E. ≥ 0.64 | |
| 5. |
Assuming that CO obeys perfect gas law, calculate the density of CO (in kg/m) at 263°C and 2 atm. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 6. |
Heat capacity of air can be approximately expressed as, = 26.693 + 7.365 x10 , where, is in J/mole. and is in . 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 | |
| 7. |
Equal masses of CH and H are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is |
| A. | 1/9 |
| B. | 8/9 |
| C. | 1/2 |
| D. | 5/9 |
| Answer» C. 1/2 | |
| 8. |
6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H produced will be __________ gm. |
| A. | 0.5 |
| B. | 1 |
| C. | 3 |
| D. | 5 |
| Answer» B. 1 | |
| 9. |
At room temperature, the product [H] [OH] in a solution is 10 moles/litre. If, [OH] = 10 moles/litre, then the pH of the solution will be |
| A. | 6 |
| B. | 8 |
| C. | 10 |
| D. | 12 |
| Answer» C. 10 | |
| 10. |
Density of carbon dioxide is __________ kg/Nm. |
| A. | 44/22400 |
| B. | 44/22.4 |
| C. | 22.4/44 |
| D. | none of these |
| Answer» C. 22.4/44 | |
| 11. |
N 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. | 80% |
| B. | 90% |
| C. | 95% |
| D. | 98% |
| Answer» C. 95% | |
| 12. |
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 | |
| 13. |
CaCO contains __________ percent of Ca by weight. |
| A. | 40 |
| B. | 48 |
| C. | 96 |
| D. | 12 |
| Answer» B. 48 | |
| 14. |
Kinematic viscosity of 1 m /second is equivalent to __________ stokes. |
| A. | 10 |
| B. | 10 |
| C. | 10 |
| D. | 10 |
| Answer» E. | |
| 15. |
In the reaction, represented by NaCO + HC1 → NaHO + NaCl, the equivalent weight of NaCO is |
| A. | 53 |
| B. | 5.3 |
| C. | 106 |
| D. | 10.6 |
| Answer» D. 10.6 | |
| 16. |
1 kg/cm 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. |
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 amount of water vapour condensed (in kg) is |
| A. | 0.0 |
| B. | 0.065 |
| C. | 0.1 |
| D. | 1.0 |
| Answer» C. 0.1 | |
| 18. |
The reaction A + B → C has been conducted in a reactor as shown below. The number of balances (material) that can be made around the reactor are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 19. |
The density of a liquid is 1500 kg/m. Its value in gin/litre will be equal to |
| A. | 1.5 |
| B. | 15 |
| C. | 150 |
| D. | 1500 |
| Answer» E. | |
| 20. |
/ for monoatomic gases is |
| A. | 1.44 |
| B. | 1.66 |
| C. | 1.99 |
| D. | 1 |
| Answer» C. 1.99 | |
| 21. |
The molecular velocity of a real gas is proportional to (where, = absolute temperature of the gas). |
| A. | T |
| B. | T |
| C. | 1/ |
| Answer» B. T | |
| 22. |
The OH concentration in a solution having pH value 3 is |
| A. | 10 |
| B. | 10 |
| C. | 10 |
| D. | 10 |
| Answer» D. 10 | |
| 23. |
Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [] = hydrogen ion concentration in the solution). |
| A. | none of these |
| Answer» B. | |
| 24. |
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° | |
| 25. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH + 2O → CO + 2HO. Both the reactants and products are in gas phase. ΔH° = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about |
| A. | 0.19 |
| B. | 0.33 |
| C. | 0.40 |
| D. | 0.67 |
| Answer» B. 0.33 | |
| 26. |
If 1 Nm of O contains 'N' number of molecules, then number of molecules in 2Nm of SO will be |
| A. | N |
| B. | N/2 |
| C. | 2N |
| D. | 4N |
| Answer» D. 4N | |
| 27. |
The pressure of '' litres of a dry gas is increased from 1 to 2 kgf/cm at a constant temperature. The new volume will become |
| A. | /2 |
| B. | 2 |
| C. | /4 |
| Answer» B. 2 | |
| 28. |
At standard conditions, N + 2O 2NO; ΔG° = 100 kJ/moleNO + O 2NO; 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 | |
| 29. |
The equilibrium data of component in the two phases and are given below. The estimate of Y for = 4 by fitting a quadratic expression of a form = m for the above data is |
| A. | 15.5 |
| B. | 16 |
| C. | 16.5 |
| D. | 17 |
| Answer» D. 17 | |
| 30. |
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 and the vapour pressures of benzene and water at these conditions are and respectively. The partial pressure of benzene in air-vapour mixture is |
| A. | . |
| B. | ( |
| C. | - |
| D. | ) |
| E. | . |
| Answer» C. - | |
| 31. |
1 kg of calcium carbide (CaC) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ? |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» C. 15 | |
| 32. |
The hydroxyl ion (OH) concentration in a solution having pH value 3 will be |
| A. | 10 |
| B. | 10 |
| C. | 10 |
| D. | 10 |
| Answer» B. 10 | |
| 33. |
The number of atoms of oxygen present in 11.2 litres of ozone (O) at N.T.P. are |
| A. | 3.01 x 10 |
| B. | 6.02 x 10 |
| C. | 9.03 x 10 |
| D. | 1.20 x 10 |
| Answer» D. 1.20 x 10 | |
| 34. |
1 Pascal (unit of pressure) is equal to __________ N/m. |
| A. | 10 |
| B. | 1 |
| C. | 0.1 |
| D. | 1000 |
| Answer» C. 0.1 | |
| 35. |
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 | |
| 36. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH + 2O → CO + 2HO. Both the reactants and products are in gas phase. ΔH° = - 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. | |
| 37. |
NaSO. 10HO crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of NaSO. 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. | |
| 38. |
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 | |
| 39. |
On mixing 56 gm of CaO with 63 gm of HNO, the amount of Ca(NO) formed is __________ gm. |
| A. | 82 |
| B. | 164 |
| C. | 41 |
| D. | 8.2 |
| Answer» B. 164 | |
| 40. |
A flowsheet is given in the following figure: If the single pass once through conversion of A to B is 20%, then the rate of recycle R (molds/hr) is |
| A. | 300 |
| B. | 400 |
| C. | 500 |
| D. | 600 |
| Answer» D. 600 | |
| 41. |
40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is |
| A. | 1/2 |
| B. | 1/3 |
| C. | 1/4 |
| D. | 2/3 |
| Answer» C. 1/4 | |
| 42. |
A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be = 29.1 J/mole.°C and, = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is |
| A. | 13728 J |
| B. | 19206 J |
| C. | 4576 J |
| D. | 12712 J |
| Answer» C. 4576 J | |
| 43. |
For a reacation, → , if the concentration of '' is tripled; the rate becomes nine times. The order of reaction is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 44. |
The total number of atoms in 8.5 gm of NH is __________ x 10. |
| A. | 9.03 |
| B. | 3.01 |
| C. | 1.204 |
| D. | 6.02 |
| Answer» B. 3.01 | |
| 45. |
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 | |
| 46. |
80 kg of NaSO (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of NaSO .10HO crystals separate out. The weight fraction of NaSO in the remaining solution is |
| A. | 0.00 |
| B. | 0.18 |
| C. | 0.24 |
| D. | 1.00 |
| Answer» C. 0.24 | |
| 47. |
The molar composition of a gas is 10% H, 10% O, 30% CO and balance HO. If 50% HO condenses, the final mole percent of H in the gas on a dry basis will be |
| A. | 10% |
| B. | 5% |
| C. | 18.18% |
| D. | 20% |
| Answer» E. | |
| 48. |
equals at |
| A. | 0°C |
| B. | 0°K |
| C. | 0°F |
| D. | 0°R |
| Answer» C. 0°F | |
| 49. |
If 1.5 moles of oxygen combines with aluminium to form AlO, 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 | |
| 50. |
for monoatomic gases is equal to(where, = gas constant) |
| A. | 1.5 |
| B. | 2 |
| C. | 3 |
| Answer» C. 3 | |