MCQOPTIONS
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MCQOPTIONS
This section includes 336 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. |
_ 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 m³. 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 m³. The amount of water vapour condensed (in kg) is$? |
| A. | 0.0 |
| B. | 0.065 |
| C. | 0.1 |
| D. | 1.0 |
| Answer» C. 0.1 | |
| 152. |
_ The chemical nature of an element is independent of$? |
| 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 | |
| 153. |
_ Validity of the relationship, inputs = outputs, holds good for the system at steady state$? |
| A. | With chemical reaction |
| B. | Without chemical reaction |
| C. | Without chemical reaction & losses |
| D. | None of these |
| Answer» D. None of these | |
| 154. |
_ With increase in the solute concentration, the specific heat of aqueous solutions$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Either A or B; depends on the type of solution |
| Answer» C. Remains unchanged | |
| 155. |
_ Weight of 56 litres of ammonia at N.T.P. is __________ gm.$? |
| A. | 2.5 |
| B. | 42.5 |
| C. | 56 |
| D. | 2800 |
| Answer» C. 56 | |
| 156. |
_ If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature.$? |
| A. | The solvent begins to freeze out even before |
| B. | It will undergo no change until |
| C. | It will not solidify even on |
| D. | None of these |
| Answer» C. It will not solidify even on | |
| 157. |
_ A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is$? |
| A. | 2 |
| B. | 1 |
| C. | 0.5 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 158. |
_ Sodium __________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature.$? |
| A. | Carbonate (monohydrate) |
| B. | Chloride |
| C. | Thiosulphate |
| D. | Bisulphite |
| Answer» B. Chloride | |
| 159. |
_ The unit of dynamic viscosity is$? |
| A. | Stoke |
| B. | Poise |
| C. | Gm/cm sec |
| D. | Both B & C |
| Answer» E. | |
| 160. |
_ Pick out the wrong statement about the recycle stream in a process.$? |
| A. | Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants |
| B. | The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio |
| C. | Recycling in a process does not help in getting higher extent of reaction |
| D. | Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column |
| Answer» D. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column | |
| 161. |
_ What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20)?$? |
| A. | AB‚ÇÉ |
| B. | A‚ÇÇB‚ÇÉ |
| C. | A‚ÇÇB |
| D. | AB‚ÇÇ |
| Answer» B. A‚Äö√á√áB‚Äö√á√â | |
| 162. |
_ The temperature at which real gases obey the ideal gas law over a wide range of pressure is called the __________ temperature.$? |
| A. | Reduced |
| B. | Boyle |
| C. | Critical |
| D. | Inversion |
| Answer» E. | |
| 163. |
_ 80 kg of Na‚ÇÇSO‚ÇÑ (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na‚ÇÇSO‚ÇÑ .10H‚ÇÇO crystals separate out. The weight fraction of Na‚ÇÇSO‚ÇÑ in the remaining solution is$? |
| A. | 0.00 |
| B. | 0.18 |
| C. | 0.24 |
| D. | 1.00 |
| Answer» C. 0.24 | |
| 164. |
_ 1 torr is equivalent to$? |
| A. | 1 mm Hg |
| B. | 1 Pascal |
| C. | 1 ata |
| D. | 1 mm wc |
| Answer» B. 1 Pascal | |
| 165. |
_ 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 m³. 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 m³. The latent heat of condensation (kJ/kg⁻¹ ) under these conditions is$? |
| A. | 40732 |
| B. | 2676 |
| C. | 2263 |
| D. | 540 |
| Answer» D. 540 | |
| 166. |
_ Cp/Cv for monoatomic gases is$? |
| A. | 1.44 |
| B. | 1.66 |
| C. | 1.99 |
| D. | 1 |
| Answer» C. 1.99 | |
| 167. |
_ Gases diffuse faster compared to liquids because of the reason that the liquid molecules$? |
| A. | Are held together by stronger inter-molecular forces |
| B. | Move faster |
| C. | Have no definite shape |
| D. | Are heavier |
| Answer» B. Move faster | |
| 168. |
_ Viscosity of 1 centipoise is equal to 1 centis-toke in case of$? |
| A. | Water |
| B. | Mercury |
| C. | Carbon tetrachloride |
| D. | None of these |
| Answer» B. Mercury | |
| 169. |
_ A saturated vapor on being compressed would$? |
| A. | Condense |
| B. | Form wet steam |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 170. |
_ With rise in temperature, the solubility of ammonia in water at a fixed pressure$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases exponentially |
| Answer» C. Remains unchanged | |
| 171. |
_ 500 c.c. each of hydrogen at 700 mm Hg pressure and oxygen at 600 mm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be __________ mm Hg.$? |
| A. | 650 |
| B. | 700 |
| C. | 600 |
| D. | 375 |
| Answer» B. 700 | |
| 172. |
_ The reverse process of fractional crystallisation is called$? |
| A. | Stripping |
| B. | Leaching |
| C. | Differential distillation |
| D. | Absorption |
| Answer» C. Differential distillation | |
| 173. |
_ In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the$? |
| A. | Total pressure |
| B. | Absolute humidity at a given temperature |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 174. |
_ In general, the specific heats of aqueous solutions __________ with increase in the concentration of the solute.$? |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | None of these |
| Answer» C. Remain unchanged | |
| 175. |
_ Simultaneous doubling of the absolute temperature of a gas and reduction of its pressure to half, will result in __________ in the volume of the gas.$? |
| A. | No change |
| B. | Doubling |
| C. | L/4th reduction |
| D. | Four fold increase |
| Answer» C. L/4th reduction | |
| 176. |
_ Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?$? |
| A. | ΔH = 1 (+ ve)and Δ V = -ve |
| B. | ΔH = 0 |
| C. | ΔV = 0 |
| D. | Both B and C |
| Answer» E. | |
| 177. |
_ 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?$? |
| A. | 2/3 |
| B. | 1/3 |
| C. | 1/2 |
| D. | L/3 x 298/273 |
| Answer» C. 1/2 | |
| 178. |
_ Addition of a non-volatile solute to a pure solvent$? |
| A. | Increases its freezing point |
| B. | Increases its boiling point |
| C. | Decreases its freezing point |
| D. | Both B and C |
| Answer» E. | |
| 179. |
_ Dry air is a mixture of$? |
| A. | Vapors |
| B. | Gases |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» C. Both A & B | |
| 180. |
_ The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface. This statement pertaining to the solubility of gases in liquid is the __________ law.$? |
| A. | Raoult's |
| B. | Henry's |
| C. | Amgat's |
| D. | None of these |
| Answer» C. Amgat's | |
| 181. |
_ 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$? |
| A. | 0.19 |
| B. | 0.33 |
| C. | 0.40 |
| D. | 0.67 |
| Answer» B. 0.33 | |
| 182. |
_ The vapor pressure of water at 100°C is$? |
| A. | 100N/m² |
| B. | 76 cms of Hg |
| C. | 13.6 cms of Hg |
| D. | 760 mm wc |
| Answer» C. 13.6 cms of Hg | |
| 183. |
_ 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$? |
| A. | Kinetic energy |
| B. | Intermolecular forces of attraction |
| C. | Potential energy |
| D. | Total energy |
| Answer» B. Intermolecular forces of attraction | |
| 184. |
_ Dissolving a solute in a solvent does not change its$? |
| A. | Specific heat |
| B. | Vapour pressure |
| C. | Viscosity |
| D. | None of these |
| Answer» E. | |
| 185. |
_ An ideal gas can be liquified, because$? |
| A. | Its molecular size is very small |
| B. | Its critical temperature is more than 0°C |
| C. | Forces operative between its molecules are negligible |
| D. | It gets solidified directly without becoming liquid |
| Answer» D. It gets solidified directly without becoming liquid | |
| 186. |
_ Density of carbon dioxide is __________ kg/Nm³.$? |
| A. | 44/22400 |
| B. | 44/22.4 |
| C. | 22.4/44 |
| D. | None of these |
| Answer» C. 22.4/44 | |
| 187. |
_ The heat of solution depends upon the$? |
| A. | Nature of solvent |
| B. | Concentration of solution |
| C. | Nature of solute |
| D. | All of the above |
| Answer» E. | |
| 188. |
_ Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the$? |
| A. | Sizes of the component molecules are approximately equal |
| B. | Attractive forces between like and unlike molecules are approximately equal |
| C. | Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution |
| D. | All of the above |
| Answer» E. | |
| 189. |
_ A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is$? |
| A. | N‚ÇÇO‚ÇÑ |
| B. | N‚ÇÇO‚ÇÖ |
| C. | N‚ÇÇO‚ÇÉ |
| D. | None of these |
| Answer» C. N‚Äö√á√áO‚Äö√á√â | |
| 190. |
_ Which of the following is not a colligative property?$? |
| A. | Osmotic pressure |
| B. | Depression of freezing point |
| C. | Lowering of vapor pressure |
| D. | None of these |
| Answer» E. | |
| 191. |
_ With increase in temperature, the surface tension of water$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Increases linearly |
| Answer» C. Remains constant | |
| 192. |
_ At higher temperatures, molal heat capacities for most of the gases (at constant pressure) __________ with increase in temperature.$? |
| A. | Varies linearly |
| B. | Increases |
| C. | Decreases |
| D. | Does not vary |
| Answer» C. Decreases | |
| 193. |
_ Ideal solution is formed, when its components have zero$? |
| A. | Heat of mixing |
| B. | Volume change |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 194. |
_ A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be$? |
| A. | 0°C |
| B. | 0°K |
| C. | -136.5°C |
| D. | -136.5°K |
| Answer» D. -136.5¬¨‚àûK | |
| 195. |
_ Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules$? |
| A. | Do not lose energy on collision |
| B. | Are above the inversion temperature |
| C. | Do not exert attractive force on each other |
| D. | Do work equal to loss in kinetic energy |
| Answer» D. Do work equal to loss in kinetic energy | |
| 196. |
__Cp equals Cv at__ |
| A. | 0°C |
| B. | 0°K |
| C. | 0°F |
| D. | 0°R |
| Answer» C. 0¬¨‚àûF | |
| 197. |
_pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be$? |
| A. | 0 |
| B. | 10 |
| C. | 7 |
| D. | 14 |
| Answer» D. 14 | |
| 198. |
_Isotopes are atoms having the same$? |
| A. | Mass number |
| B. | Number of neutrons |
| C. | Atomic mass |
| D. | None of these |
| Answer» E. | |
| 199. |
_Which of the following gravity scales is used exclusively for liquids heavier than water?$? |
| A. | Baumme scale |
| B. | Twaddel scale |
| C. | API scale |
| D. | None of these |
| Answer» C. API scale | |
| 200. |
_Atmospheric pressure corresponds to a hydrostatic head of$? |
| A. | 13.6 cms of Hg |
| B. | 34 ft ofH‚ÇÇO |
| C. | 1 metre of H‚ÇÇO |
| D. | 13.6 metres of Hg |
| Answer» C. 1 metre of H‚Äö√á√áO | |