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.
| 251. |
Kinematic viscosity of 1 m² /second is equivalent to __________ stokes. |
| A. | 10 |
| B. | 102 |
| C. | 103 |
| D. | 104 |
| Answer» E. | |
| 252. |
Vapor pressure of a solution is proportional to(where, Sv and St are mole fraction of solvent and solute respectively). |
| A. | Sv |
| B. | 1/St |
| C. | St |
| D. | 1/Sv |
| Answer» B. 1/St | |
| 253. |
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 | |
| 254. |
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 | |
| 255. |
A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO₂, 0.05 gm mole of oxygen and 0.80 gm mole of N₂. What is its molecular weight? |
| A. | 28.6 |
| B. | 30.0 |
| C. | 30.6 |
| D. | 32.6 |
| Answer» D. 32.6 | |
| 256. |
The value of (Cp - Cv)for a real gas obeying Vander Wall's equation is |
| A. | R |
| B. | > R |
| C. | < R |
| D. | 0.5 R |
| Answer» C. < R | |
| 257. |
1 BTU/ft³ is approximately equal to __________ kcal/m³. |
| A. | 1 |
| B. | 9 |
| C. | 4 |
| D. | 252 |
| Answer» C. 4 | |
| 258. |
Which of the following is not a unit of length? |
| A. | Parsec |
| B. | Angstrom |
| C. | Barn |
| D. | Fermi |
| Answer» D. Fermi | |
| 259. |
For an endothermic reaction, the minimum value of energy of activation will be (where, ΔH = enthalpy of the reaction) |
| A. | Δ H |
| B. | >ΔH |
| C. | <ΔH |
| D. | 0 |
| Answer» C. <ΔH | |
| 260. |
Which of the following is not used for computing latent heat of vaporisation? |
| A. | Clausius-Clayperon equation |
| B. | Reference substance plots based on Durhing & Othmer plots |
| C. | Kistyakowasky's equation |
| D. | Hess |
| Answer» E. | |
| 261. |
The heat change for the reaction, C(s) + 2S(s) → CS₂(l), is 104.2 kJ. It represents the heat of |
| A. | Formation |
| B. | Solution |
| C. | Combustion |
| D. | Fusion |
| Answer» B. Solution | |
| 262. |
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 | |
| 263. |
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 | |
| 264. |
1 gm mole of methane (CH₄) contains |
| A. | 6.02 x 1023 atoms of hydrogen |
| B. | 4 gm atoms of hydrogen |
| C. | 3.01 x 1023 molecules of methane |
| D. | 3 gms of carbon |
| Answer» C. 3.01 x 1023 molecules of methane | |
| 265. |
At standard conditions,N₂ + 2O₂ ⇋ 2NO₂; ΔG° = 100 kJ/moleNO + ½O₂ ⇋ 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 | |
| 266. |
Equal masses of CH₄ and H₂ 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 | |
| 267. |
1 BTU/lb.←°F is equivalent to __________ kcal/kg.°C. |
| A. | 1 |
| B. | 2.42 |
| C. | 1.987 |
| D. | 4.97 |
| Answer» B. 2.42 | |
| 268. |
1 Kcal/kg. °C is equivalent to __________ BTU/lb. °F. |
| A. | 1 |
| B. | 2.42 |
| C. | 4.97 |
| D. | None of these |
| Answer» B. 2.42 | |
| 269. |
If 1 Nm³ of O₂ contains 'N' number of molecules, then number of molecules in 2Nm³ of SO₂ will be |
| A. | N |
| B. | N/2 |
| C. | 2N |
| D. | 4N |
| Answer» D. 4N | |
| 270. |
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 | |
| 271. |
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. | |
| 272. |
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 | |
| 273. |
Which of the following is insensitive to changes in pressure? |
| A. | Heat of vaporisation |
| B. | Melting point |
| C. | Heat of fusion |
| D. | Both B & C |
| Answer» E. | |
| 274. |
Which of the following gases is the most soluble in water? |
| A. | NH₃ |
| B. | CO₂ |
| C. | H₂S |
| D. | CH₄ |
| Answer» B. CO₂ | |
| 275. |
Which of the following is not a unit of pressure? |
| A. | Parsec |
| B. | Kilo-pascal |
| C. | Bar |
| D. | Newton/metre² |
| Answer» B. Kilo-pascal | |
| 276. |
A vessel of volume 1000 m³ contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately |
| A. | 17 |
| B. | 20 |
| C. | 25 |
| D. | 34 |
| Answer» B. 20 | |
| 277. |
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. | |
| 278. |
For a reacation, 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 | |
| 279. |
If 1.5 moles of oxygen combines with aluminium to form Al2O₃, 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 | |
| 280. |
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 | |
| 281. |
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 | |
| 282. |
The combustion equations of carbon and carbon monoxide are as follows:C + O₂ = CO₂, ΔH = - 394 kJ/kg . mole CO + 1/2 O₂ = CO₂, ΔH = - 284.5 kJ/kg. mole.The heat of formation of CO is __________ kJ/kg. mole. |
| A. | -109.5 |
| B. | +109.5 |
| C. | +180 |
| D. | +100 |
| Answer» B. +109.5 | |
| 283. |
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 | |
| 284. |
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 | |
| 285. |
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 | |
| 286. |
A car tyre of volume 0.057 m³ is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is |
| A. | 380 |
| B. | 630 |
| C. | 760 |
| D. | 880 |
| Answer» C. 760 | |
| 287. |
The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. The temperature at which the above mixture will exert a pressure of one standard atm. is |
| A. | Less than 100°C |
| B. | 100°C |
| C. | Between 100 and 110°C |
| D. | 110.6°C |
| Answer» D. 110.6°C | |
| 288. |
The number of atoms of oxygen present in 11.2 litres of ozone (O₃) at N.T.P. are |
| A. | 3.01 x 10²² |
| B. | 6.02 x 10²³ |
| C. | 9.03 x 10²⁴ |
| D. | 1.20 x 10²⁴ |
| Answer» D. 1.20 x 10²⁴ | |
| 289. |
Avogadro number is the number of molecules in one __________ of a gas. |
| A. | Gram |
| B. | Kilogram |
| C. | Gm.mole |
| D. | Litre |
| Answer» D. Litre | |
| 290. |
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 | |
| 291. |
In the reaction, represented by Na₂CO₃ + HC₁ → NaHO₃ + NaCl, the equivalent weight of Na₂CO₃ is |
| A. | 53 |
| B. | 5.3 |
| C. | 106 |
| D. | 10.6 |
| Answer» D. 10.6 | |
| 292. |
The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements. This is the statement of |
| A. | Law of Petit and Dulong |
| B. | Kopp's rule |
| C. | Nearnst heat theorem |
| D. | Trouton's rule |
| Answer» C. Nearnst heat theorem | |
| 293. |
__________ kg of CaCO₃ on heating will give 56 kg of CaO. |
| A. | 56 |
| B. | 100 |
| C. | 144 |
| D. | 1000 |
| Answer» C. 144 | |
| 294. |
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 Cp = 29.1 J/mole.°C and, Cv = 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 | |
| 295. |
A gas mixture contains 6 moles of H₂ and 2 moles of N₂. If the total pressure of the gaseous mixture is 4 kgf/cm² ; then the partial pressure of N₂ in the mixture will be __________ kgf/cm² . |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» B. 2 | |
| 296. |
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. | |
| 297. |
The amount of Zn (atomic weight = 65) required to form 224 c.c. of H₂ at N.T.P. on treatment with dilute H₂SO₄ will be __________ gm. |
| A. | 0.065 |
| B. | 0.65 |
| C. | 6.5 |
| D. | 65 |
| Answer» C. 6.5 | |
| 298. |
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 | |
| 299. |
The unit of Cp in S.I. units is |
| A. | W/m².°K |
| B. | J/kg.°K |
| C. | W/m.°K |
| D. | J/m³. °K |
| Answer» C. W/m.°K | |
| 300. |
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 | |