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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.
| 151. |
The unit of specific heat at constant pressure, Cᵨ, in SI unit is |
| A. | W/m²°C |
| B. | J/kg°K |
| C. | W/m°K |
| D. | J/m³°K |
| Answer» C. W/m°K | |
| 152. |
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 | |
| 153. |
Cᵥ for monoatomic gases is equal to(where, R = gas constant) |
| A. | R |
| B. | 1.5 R |
| C. | 2R |
| D. | 3R |
| Answer» C. 2R | |
| 154. |
The vapour pressure of water is given by, in Psat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately |
| A. | 0.07 |
| B. | 0.09 |
| C. | 0.11 |
| D. | 0.13 |
| Answer» E. | |
| 155. |
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 | |
| 156. |
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. | 1/3 x 298/273 |
| Answer» C. 1/2 | |
| 157. |
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. | 4480 |
| B. | 2240 |
| C. | 1120 |
| D. | 0.4 |
| Answer» B. 2240 | |
| 158. |
The heats of vaporisation of CS₂, C₂H₅OH & H₂O are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is |
| A. | H₂O > C₂H₅OH > CS₂ |
| B. | CS₂ > C₂H₅OH > H₂O |
| C. | H₂O > CS₂ > C₂H₅OH |
| D. | CS₂ > H₂O > C₂H₅OH |
| Answer» B. CS₂ > C₂H₅OH > H₂O | |
| 159. |
For a reaction, X → 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 | |
| 160. |
Cᵨ equals Cᵥ at |
| A. | 0°C |
| B. | 0°K |
| C. | 0°F |
| D. | 0°R |
| Answer» C. 0°F | |
| 161. |
The value of Trouton's ratio (λb/Tb) for a number of substances is 21 (where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids. |
| A. | polar |
| B. | non-polar |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 162. |
How much O₂ can be obtained from 90 kg of water ? |
| A. | 32 kg |
| B. | 80 kg |
| C. | 64 kg |
| D. | 90 kg |
| Answer» C. 64 kg | |
| 163. |
An equation for calculating vapour pressure is given by, log₁₀ 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 | |
| 164. |
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 | |
| 165. |
For the gaseous phase reaction, N₂ + O₂ ↔ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by |
| A. | increasing the concentration of N₂. |
| B. | decrease in temperature. |
| C. | increase in pressure. |
| D. | decrease in pressure. |
| Answer» C. increase in pressure. | |
| 166. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°₂₉₈ = - 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 | |
| 167. |
1 kg of calcium carbide (CaC₂) 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 | |
| 168. |
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 | |
| 169. |
The reaction A + B → C has been conducted in a reactor as shown below. The number of boundaries around which material balance can be written, are |
| A. | 1 |
| B. | 6 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 170. |
Which of the following is the Claussius-Clayperon equation ? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 171. |
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 | |
| 172. |
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 | |
| 173. |
Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H⁺] = hydrogen ion concentration in the solution). |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 174. |
1 kgf/cm² is not equal to |
| A. | 1 torr |
| B. | 1 bar |
| C. | 10000 mm wc |
| D. | 100 KPa = 100 000 N/m² |
| Answer» B. 1 bar | |
| 175. |
20 grams of CaCO₃ is heated, how much calcium oxide will produce? |
| A. | 5.6 grams |
| B. | 11.2 grams |
| C. | 22.4 grams |
| D. | 44.8 grams |
| Answer» C. 22.4 grams | |
| 176. |
56 grams of carbon monoxide is oxidized with excess oxygen, how much carbon dioxide will it produce? |
| A. | 22 grams |
| B. | 44 grams |
| C. | 66 grams |
| D. | 88 grams |
| Answer» E. | |
| 177. |
Pentane is burnt to produce carbon dioxide 40% of which can be converted into carbon monoxide, how much Butane must be burnt to produce 176 grams of carbon monoxide? |
| A. | 18 grams |
| B. | 36 grams |
| C. | 72 grams |
| D. | 96 grams |
| Answer» C. 72 grams | |
| 178. |
1 mole of glucose is burnt, how much carbon dioxide will it produce? |
| A. | 44 grams |
| B. | 176 grams |
| C. | 264 grams |
| D. | 352 grams |
| Answer» C. 264 grams | |
| 179. |
78 grams of benzene is burnt in air, how much water will it produce? |
| A. | 18 grams |
| B. | 36 grams |
| C. | 54 grams |
| D. | 72 grams |
| Answer» D. 72 grams | |
| 180. |
Cᵨ is expressed in S.I. unit as |
| A. | J/kg.°K |
| B. | 0°K |
| C. | W/m². °C |
| D. | W/m. °K |
| Answer» B. 0°K | |
| 181. |
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 = mX² for the above data is |
| A. | 15.5 |
| B. | 16 |
| C. | 16.5 |
| D. | 17 |
| Answer» D. 17 | |
| 182. |
At standard conditions, N₂ + 2O₂ ↔ 2NO₂; ΔG° = 100 kJ/moleNO + 1/2O₂ ↔ 2NO₂; 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 | |
| 183. |
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 0.74 x 10⁻⁵ m²/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 | |
| 184. |
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 3/4 (0.75ρ)at a temperature of __________ °K |
| A. | 273° |
| B. | 300° |
| C. | 400° |
| D. | 300° |
| Answer» D. 300° | |
| 185. |
If 28 grams of N₂ and 10 grams of H₂ are reacted, how much NH₃ will produce? |
| A. | 17 grams |
| B. | 34 grams |
| C. | 51 grams |
| D. | 54 grams |
| Answer» C. 51 grams | |
| 186. |
10 grams of NaCl and 1.8 grams of H₂O are reacted, how much sodium hydroxide will produce? |
| A. | 4 grams |
| B. | 10 grams |
| C. | 40 grams |
| D. | 80 grams |
| Answer» B. 10 grams | |
| 187. |
5 moles of Al₂O₃ are reacted with 10 moles H₂SO₄, how many moles of Al₂(SO₄)3 will produce? |
| A. | 3.33 |
| B. | 10 |
| C. | 30 |
| D. | 33.3 |
| Answer» B. 10 | |
| 188. |
1 mole of potassium permanganate and 1 mole of ferrous sulfide are reacted in presence of excess hydroChloric acid, how many moles of Ferric sulfate will produce? |
| A. | 10/18 |
| B. | 5/18 |
| C. | 1/18 |
| D. | 1/36 |
| Answer» C. 1/18 | |
| 189. |
Cᵨ/Cᵥ for monoatomic gases is |
| A. | 1.44 |
| B. | 1.66 |
| C. | 1.99 |
| D. | 1 |
| Answer» C. 1.99 | |
| 190. |
A solution of specific gravity 1 consists of 35% A by weight and the remaining B. If the specific gravity of A is 0.7, the specific gravity of B is |
| A. | 1.25 |
| B. | 1.3 |
| C. | 1.35 |
| D. | 1.2 |
| Answer» E. | |
| 191. |
4 moles of CO and 2 moles of O₂ are reacted, then what type of reactant O₂ is? |
| A. | Limiting reagent |
| B. | Excess reagent |
| C. | Can’t say |
| D. | None of the mentioned |
| Answer» E. | |
| 192. |
Which of the following is true about limiting reagents? |
| A. | Consumes completely |
| B. | Consumes partially |
| C. | Does not react |
| D. | None of the mentioned |
| Answer» B. Consumes partially | |
| 193. |
Which of the following is true about excess reagents? |
| A. | Consumes completely |
| B. | Consumes partially |
| C. | Does not react |
| D. | None of the mentioned |
| Answer» C. Does not react | |
| 194. |
4 moles of CH₄ and 4 moles of O₂ are reacted, then what type of reactant CH₄ is? |
| A. | Limiting reagent |
| B. | Excess reagent |
| C. | Can’t say |
| D. | None of the mentioned |
| Answer» C. Can’t say | |
| 195. |
2 moles of N₂ and 8 moles of H₂ are reacted, then what type of reactant N₂ is? |
| A. | Limiting reagent |
| B. | Excess reagent |
| C. | Can’t say |
| D. | None of the mentioned |
| Answer» B. Excess reagent | |
| 196. |
xFeS₂ + yO₂ -> zFe₂O₃ + wSO₂, what is the value of x + y + z + w? |
| A. | 16 |
| B. | 21 |
| C. | 25 |
| D. | 32 |
| Answer» D. 32 | |
| 197. |
60 grams of FeS₂, is burnt in air, how much sulfur dioxide will produce? |
| A. | 16 grams |
| B. | 32 grams |
| C. | 64 grams |
| D. | 128 grams |
| Answer» D. 128 grams | |
| 198. |
xKMnO₄ + yFeS + zH₂SO₄ -> xMnSO₄ + wFe₂(SO₄)₃ + uK₂SO₄ + zH₂O, what is the value of x + y + z + w + u? |
| A. | 60 |
| B. | 74 |
| C. | 85 |
| D. | 98 |
| Answer» C. 85 | |
| 199. |
158 grams of potassium permanganate is reacted with ferrous sulfide in the presence of hydroChloric acid, approximately how much ferric sulfate will it produce? |
| A. | 111 grams |
| B. | 169 grams |
| C. | 254 grams |
| D. | 399 grams |
| Answer» B. 169 grams | |
| 200. |
What is extent of reaction of a in the reaction 2CO + O₂ -> 2CO₂, if 20 moles CO₂ is produced? |
| A. | 5 |
| B. | 10 |
| C. | 20 |
| D. | 40 |
| Answer» C. 20 | |