MCQOPTIONS
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MCQOPTIONS
This section includes 95 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. |
A mixture contains 10% CO, 40% CO₂ and 50% H₂O, what is the mass percent of CO₂? |
| A. | 9.5 |
| B. | 15.4 |
| C. | 39.5 |
| D. | 74.1 |
| Answer» B. 15.4 | |
| 2. |
A mixture contains 80% of HCl and 20% H₂O by weight, what is the mole fraction of HCl? |
| A. | 0.15 |
| B. | 0.29 |
| C. | 0.45 |
| D. | 0.66 |
| Answer» E. | |
| 3. |
If hydrogen is 14% by weight in CH₃(OH)x(NH₃)y, then what is the possible value of x*y? |
| A. | 6 |
| B. | 12 |
| C. | 18 |
| D. | 24 |
| Answer» B. 12 | |
| 4. |
A solution with density 1 g/cm³ has 98 grams of H₂SO₄ in 402 grams of water, what is the concentration of solution? |
| A. | 1 molar |
| B. | 2 molar |
| C. | 3 molar |
| D. | 4 molar |
| Answer» C. 3 molar | |
| 5. |
A compound contains 40% of Sulphur and 60% of Oxygen, what is the empirical formula of the compound? |
| A. | SO₂ |
| B. | SO₃ |
| C. | SO₄ |
| D. | None of the mentioned |
| Answer» C. SO₄ | |
| 6. |
The mole percent of H₂ and N₂ in a mixture is 50% each, what is the mass percentage of H₂? |
| A. | 12.5 |
| B. | 25 |
| C. | 50 |
| D. | 87.5 |
| Answer» B. 25 | |
| 7. |
What is the mole fraction of sodium with moles n in a solution with moles of solvent N? |
| A. | N/n |
| B. | n/N |
| C. | n/(n + N) |
| D. | N/(n + N) |
| Answer» D. N/(n + N) | |
| 8. |
Which of the following is not the unit of concentration? |
| A. | Mole/m³ |
| B. | Molar |
| C. | N/m³ |
| D. | ppm |
| Answer» D. ppm | |
| 9. |
What is the mass fraction of 4 moles of Sodium in 8 moles of Hydrogen chloride? |
| A. | 0.24 |
| B. | 0.48 |
| C. | 0.56 |
| D. | 0.72 |
| Answer» B. 0.48 | |
| 10. |
A mixture contains 20% CO₂, 30% SO₂ and 50% H₂O, what is the mass percent of CO₂? |
| A. | 23 |
| B. | 45 |
| C. | 66 |
| D. | 87 |
| Answer» B. 45 | |
| 11. |
If the mole fraction of 4.5 moles of solute is 0.5, what is the number of moles of solvent? |
| A. | 9 |
| B. | 4.5 |
| C. | 1.5 |
| D. | 3 |
| Answer» C. 1.5 | |
| 12. |
A mixture contains 23 g of ethanol and 36 g of water, some acetic acid is added to the mixture and its mole fraction becomes 0.5, how much acetic acid was added? |
| A. | 25 g |
| B. | 75 g |
| C. | 100 g |
| D. | 150 g |
| Answer» E. | |
| 13. |
A mixture of gases SO₂, O₂ and 4 g of N₂ and total mass of mixture is 10 g, what is the sum of mole fraction of SO₂ and O₂? |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.75 |
| D. | 1 |
| Answer» D. 1 | |
| 14. |
If the mole fraction of SO₂ in H₂SO₄ is 0.2, what is the ratio of mass of sulfur and oxygen in the solution? |
| A. | 0.166 |
| B. | 6 |
| C. | 1.8 |
| D. | 0.555 |
| Answer» E. | |
| 15. |
What is the value of x in C₂H₈(OH)x if the percentage by weight of hydrogen is 12%? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 16. |
If a compound contains 48% of Carbon, 48% of oxygen and 8% of hydrogen by weight, then what is the possible molecular formula of the compound? |
| A. | C₂H₄O |
| B. | CH₄O₃ |
| C. | C₄H₄O₃ |
| D. | C₄H₈O₃ |
| Answer» E. | |
| 17. |
10 moles of oxygen divides and enters two reactors flow rate 45 kg/s and leaves the reactors at the flow rates of 6 kg/s and 9 kg/s, what are number of moles of oxygen that leaves the reactor with 9 kg/s? |
| A. | 180 |
| B. | 450 |
| C. | 60 |
| D. | 90 |
| Answer» E. | |
| 18. |
1 mole of Carbon dioxide enters in a reactor at a rate of 0.25 kg/s and leaves it at the rate of 1 kg/s, what are the number of moles of carbon dioxide leaves the reactor? |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.75 |
| D. | 1 |
| Answer» B. 0.5 | |
| 19. |
What is the unit of mole fraction? |
| A. | Kg/m³ |
| B. | N/m³ |
| C. | m¯² |
| D. | None of the mentioned |
| Answer» E. | |
| 20. |
A Composition of carbon dioxide, oxygen and nitrogen with mole ratio 1:2:5 with 4 moles of oxygen, enters a reactor with a flow rate of 100 kg/s, the ratio of rates of leaving the reactor of the three is 5:2:1, and 5 moles of nitrogen leaves the reactor, what is the total number of moles leaving the reactor? |
| A. | 6.1 |
| B. | 6.2 |
| C. | 6.3 |
| D. | 6.4 |
| Answer» C. 6.3 | |
| 21. |
The Velocity of water in a pipe of area 5 m² is 10 m/s, what will be the flow rate of water? |
| A. | 25 m³/s |
| B. | 50 m³/s |
| C. | 75 m³/s |
| D. | 100 m³/s |
| Answer» C. 75 m³/s | |
| 22. |
A mixture contains 80% of NaOH and 20% H₂O by weight, what is the mole fraction of NaOH? |
| A. | 0.24 |
| B. | 0.42 |
| C. | 0.64 |
| D. | 0.78 |
| Answer» D. 0.78 | |
| 23. |
What is the molarity of the mixture of two solution, first solution 4 M and 10 liter and second solution 2 M and 40 liter? |
| A. | 1.2 M |
| B. | 2.4 M |
| C. | 4.8 M |
| D. | 9.2 M |
| Answer» C. 4.8 M | |
| 24. |
Which of the following is not a unit of density? |
| A. | Kg/m³ |
| B. | N/m³ |
| C. | N.s2/m4 |
| D. | g/cm³ |
| Answer» C. N.s2/m4 | |
| 25. |
A mixture contains 9 gram each of H₂O and NaCl, what is the mole fraction of NaCl? |
| A. | 0.15 |
| B. | 0.23 |
| C. | 0.45 |
| D. | 0.64 |
| Answer» C. 0.45 | |
| 26. |
What is the molar concentration of a solution with 44 grams of CO₂ in 0.5 liter solution? |
| A. | 1 mole/liter |
| B. | 2 mole/liter |
| C. | 3 mole/liter |
| D. | 4 mole/liter |
| Answer» C. 3 mole/liter | |
| 27. |
What is the molar concentration of a solution with 32 grams of SO₂ in 0.5 liter solution? |
| A. | 1 mole/liter |
| B. | 2 mole/liter |
| C. | 3 mole/liter |
| D. | 4 mole/liter |
| Answer» B. 2 mole/liter | |
| 28. |
What is the molecular weight of a mixture that contains 25% CO₂, 40% O₂ and 35% N₂? |
| A. | 11.2 g |
| B. | 22.4 g |
| C. | 33.6 g |
| D. | 44.8 g |
| Answer» D. 44.8 g | |
| 29. |
What is the molar concentration of a solution with 40 gram of NaOH in 1 liter solution? |
| A. | 1 mole/liter |
| B. | 2 mole/liter |
| C. | 3 mole/liter |
| D. | 4 mole/liter |
| Answer» B. 2 mole/liter | |
| 30. |
A compound contain 12% of carbon, 16% of oxygen, 28% of nitrogen, 4% of hydrogen and 40% calcium by weight, then what can be the possible formula of the compound? |
| A. | C₂H₃N₂Ca(OH) |
| B. | CH₄N₄Ca₂(OH) |
| C. | CH₃N₂Ca₂(OH) |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 31. |
What is the weight of 10 moles of a mixture with composition 15% O₂, 25% SO₂, 30% COCl₂ , 25% SO₃ and 5% N₂? |
| A. | 124 |
| B. | 345 |
| C. | 507 |
| D. | 719 |
| Answer» E. | |
| 32. |
A gaseous mixture is composed of 20% CO₂, 40% O₂ and 40% N₂. What is the mass fraction of N₂? |
| A. | 0.307 |
| B. | 0.416 |
| C. | 0.529 |
| D. | 0.784 |
| Answer» B. 0.416 | |
| 33. |
A liquid mixture of O₂, CH₄ and CO has the composition 32% O₂, 16% CH₄ and 52% CO, then what is the mole fraction of CH₄? |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.25 |
| D. | 0.5 |
| Answer» C. 0.25 | |
| 34. |
What is the density of a liquid of mass 20 kg, enclosed in a cuboid of surface areas of three sides as 1 m², 2 m², 5 m², and one of its sides is 2 m? |
| A. | 1 kg/m³ |
| B. | 2 kg/m³ |
| C. | 3 kg/m³ |
| D. | 4 kg/m³ |
| Answer» C. 3 kg/m³ | |
| 35. |
A 5 molar solution is 27.75% CaCl₂ by mass, what is the density of the solution? |
| A. | 1 g/cm³ |
| B. | 2 g/cm³ |
| C. | 3 g/cm³ |
| D. | 4 g/cm³ |
| Answer» C. 3 g/cm³ | |
| 36. |
What is the concentration of a solution with 10 grams of calcium in 1000 m³ of water? |
| A. | 150 ppm |
| B. | 250 ppm |
| C. | 800 ppm |
| D. | 1000 ppm |
| Answer» C. 800 ppm | |
| 37. |
A solution with density 2 g/cm³, concentration 1 molar and weight 500 grams, then what is the mass of HNO₃ in the solution? |
| A. | 63 grams |
| B. | 126 grams |
| C. | 189 grams |
| D. | 252 grams |
| Answer» E. | |
| 38. |
What is the molarity of a solution with mass of solute 10 kg mass and 100 liter volume? |
| A. | 0.1 molar |
| B. | 1 molar |
| C. | 10 molar |
| D. | 100 molar |
| Answer» B. 1 molar | |
| 39. |
A liquid of mass 10 kg is enclosed in a cylinder of radius 1 m and length 5 m, what is the density of liquid? |
| A. | 0.54 kg/m³ |
| B. | 0.44 kg/m³ |
| C. | 0.63 kg/m³ |
| D. | 0.83 kg/m³ |
| Answer» D. 0.83 kg/m³ | |
| 40. |
What is the concentration of a 22 grams of carbon dioxide occupying 0.5 m³ volume? |
| A. | 1 mole/m³ |
| B. | 2 mole/m³ |
| C. | 11 mole/m³ |
| D. | 22 mole/m³ |
| Answer» B. 2 mole/m³ | |
| 41. |
The mole percent of CO₂ and H₂O in a mixture is 40% and 60% respectively, what is the mass percent of CO₂? |
| A. | 24.1 |
| B. | 47.2 |
| C. | 61.9 |
| D. | 78.5 |
| Answer» D. 78.5 | |
| 42. |
What is the molar concentration of a solution with 32 grams of CH₄ in 1 liter solution? |
| A. | 1 mole/liter |
| B. | 2 mole/liter |
| C. | 3 mole/liter |
| D. | 4 mole/liter |
| Answer» C. 3 mole/liter | |
| 43. |
What is the density of a substance of mass 10 grams and volume 5 liters? |
| A. | 2 kg/m³ |
| B. | 20 kg/m³ |
| C. | 200 kg/m³ |
| D. | 2000 kg/m³ |
| Answer» B. 20 kg/m³ | |
| 44. |
A solution has 25% w/w solution of Sodium Chloride in 10 grams of water what is the mole fraction of Sodium Chloride? |
| A. | 0.05 |
| B. | 0.06 |
| C. | 0.07 |
| D. | 0.08 |
| Answer» D. 0.08 | |
| 45. |
What is the mass of a liquid having density 20 kg/m³, enclosed in a sphere of radius 1 m? |
| A. | 80.7 kg |
| B. | 83.7 kg |
| C. | 85.7 kg |
| D. | 88.7 kg |
| Answer» C. 85.7 kg | |
| 46. |
What is the mass of a cube having surface area 24 m², and density 1 kg/m³? |
| A. | 1 kg |
| B. | 2 kg |
| C. | 4 kg |
| D. | 8 kg |
| Answer» E. | |
| 47. |
What is the density of a liquid of mass 10 kg and contained in a cylinder of radius 5 m and surface area (excluding top and bottom) of 10π m²? |
| A. | 0.2π kg/m³ |
| B. | 0.4π kg/m³ |
| C. | 0.5π kg/m³ |
| D. | 0.6π kg/m³ |
| Answer» C. 0.5π kg/m³ | |
| 48. |
An empty vessel has with mass 5 kg with volume 0.1 m³, is now completely filled with a liquid of density 100 kg/m³, what is the final density of the cylinder? |
| A. | 50 kg/m³ |
| B. | 100 kg/m³ |
| C. | 150 kg/m³ |
| D. | 200 kg/m³ |
| Answer» D. 200 kg/m³ | |
| 49. |
What are the number of atoms of chlorine in 250.5 grams of Cl₂O₆? |
| A. | 1.806 X 10²⁴ |
| B. | 2.408 X 10²³ |
| C. | 9.033 X 10²³ |
| D. | 6.022 X 10²³ |
| Answer» B. 2.408 X 10²³ | |
| 50. |
What are the number of moles of nitrogen in 274 grams of (NH₄)₂Ce(NO₃)₆? |
| A. | 16 |
| B. | 8 |
| C. | 6 |
| D. | 4 |
| Answer» E. | |