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.
| 301. |
Avogadro number is the number of molecules in one __________ of a gas. |
| A. | Gram |
| B. | Kilogram |
| C. | Gm.mole |
| D. | Litre |
| Answer» D. Litre | |
| 302. |
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 | |
| 303. |
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 | |
| 304. |
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 | |
| 305. |
Vapor pressure of water at 100°C is about __________ bar.$ |
| A. | 0.1013 |
| B. | 1.013 |
| C. | 10.13 |
| D. | 101.3 |
| Answer» C. 10.13 | |
| 306. |
1 kg/cm² 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 | |
| 307. |
Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces? |
| A. | RT |
| B. | (p +a/v²) |
| C. | (V - b) |
| D. | 1/RT |
| Answer» B. (p +a/v¬¨‚â§) | |
| 308. |
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 | |
| 309. |
The heat change for the reaction, C(s) + 2S(s) ‚Üí CS‚ÇÇ(l), is 104.2 kJ. It represents the heat of$ |
| A. | Formation |
| B. | Solution |
| C. | Combustion |
| D. | Fusion |
| Answer» B. Solution | |
| 310. |
The number of H‚Äö√Ö‚à´ in 1 c.c solution of pH 13 is$ |
| A. | 6.023 xl0¹³ |
| B. | 6.023 x 10¹⁰ |
| C. | 6.023xl0‚Äö√Ö‚àë |
| D. | 10¹³ |
| Answer» D. 10¬¨œÄ¬¨‚â• | |
| 311. |
At what temperature, given mass of a gas that occupies a volume of 2 litres at N.T.P. will occupy a volume of 4 litres, if the pressure of the gas is kept constant? |
| A. | 273°C |
| B. | 273°K |
| C. | 100°C |
| D. | 200°C |
| Answer» B. 273¬¨‚àûK | |
| 312. |
Equal masses of CH‚ÇÑ and H‚ÇÇ 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 | |
| 313. |
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 | |
| 314. |
At a temperature of 0°K, the molecules of a gas have only __________ energy.$ |
| A. | Rotational |
| B. | Vibrational |
| C. | Translational |
| D. | None of these |
| Answer» D. None of these | |
| 315. |
The pressure of 'V' litres of a dry gas is increased from 1 to 2 kgf/cm² at a constant temperature. The new volume will become# |
| A. | V/2 |
| B. | 2V |
| C. | V/4 |
| D. | V² |
| Answer» B. 2V | |
| 316. |
Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent? |
| A. | Temperature |
| B. | Nature of solute |
| C. | Pressure |
| D. | Nature of solvent |
| Answer» D. Nature of solvent | |
| 317. |
Which of the following is an exothermic reaction? |
| A. | Conversion of graphite to diamond |
| B. | Decomposition of water |
| C. | Dehydrogenation of ethane to ethylene |
| D. | None of these |
| Answer» E. | |
| 318. |
pH value of H‚ÇÇSO‚ÇÑ (5% concentration) is# |
| A. | 5 |
| B. | 7 |
| C. | > 7 |
| D. | < 7 |
| Answer» E. | |
| 319. |
1 gm mole of methane (CH‚ÇÑ) 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 | |
| 320. |
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 | |
| 321. |
Enthalpy of formation of NH‚ÇÉ is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH‚ÇÉ ‚Üí N‚ÇÇ + 3H‚ÇÇ, is equal to __________ kJ/kg. mole.# |
| A. | 46 |
| B. | 92 |
| C. | -23 |
| D. | -92 |
| Answer» C. -23 | |
| 322. |
The amount of Zn (atomic weight = 65) required to form 224 c.c. of H‚ÇÇ at N.T.P. on treatment with dilute H‚ÇÇSO‚ÇÑ will be __________ gm.# |
| A. | 0.065 |
| B. | 0.65 |
| C. | 6.5 |
| D. | 65 |
| Answer» C. 6.5 | |
| 323. |
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 0.74xl0-5m²/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/m¬¨‚â§.s.Pa | |
| 324. |
CaCO‚ÇÉ contains __________ percent of Ca by weight.# |
| A. | 40 |
| B. | 48 |
| C. | 96 |
| D. | 12 |
| Answer» B. 48 | |
| 325. |
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 ¾ 0.75ρ at a temperature of __________ °K# |
| A. | 273° |
| B. | 300° |
| C. | 400° |
| D. | 300° |
| Answer» D. 300¬¨‚àû | |
| 326. |
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 | |
| 327. |
1 kg/m² is equal to __________ mm water column.# |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 10 | |
| 328. |
Two solutions A‚ÇÅ and A‚ÇÇ have pH value of 2 and 6 respectively. It implies that the solution# |
| A. | A‚ÇÅ is more alkaline than solution A‚ÇÇ |
| B. | A‚ÇÅ is highly acidic |
| C. | A‚ÇÅ is very slightly acidic |
| D. | Both A & C |
| Answer» E. | |
| 329. |
A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)# |
| A. | 350 |
| B. | 485 |
| C. | 140 |
| D. | 345 |
| Answer» B. 485 | |
| 330. |
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 0.74xl0⁻⁵m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10⁻³. The rate of evaporation of aniline is 2.97 x 10⁻⁴. Its units are# |
| A. | Mole/s |
| B. | Mole/cm². s |
| C. | Mole/m² . s |
| D. | Kmole/m² . s |
| Answer» E. | |
| 331. |
Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10⁻³ T, where, Cp is in J/mole.K and T is in K. 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 | |
| 332. |
The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes. This is the __________ law. |
| A. | Dalton's |
| B. | Amgat's |
| C. | GayLussac's |
| D. | Avogadro's |
| Answer» C. GayLussac's | |
| 333. |
1 Pascal (unit of pressure) is equal to __________ N/m².# |
| A. | 10 |
| B. | 1 |
| C. | 0.1 |
| D. | 1000 |
| Answer» C. 0.1 | |
| 334. |
Which of the following is not a unit of kinematic viscosity? |
| A. | Poise |
| B. | Stoke |
| C. | Cm²/second |
| D. | None of these |
| Answer» B. Stoke | |
| 335. |
The OH⁻ concentration in a solution having pH value 3 is# |
| A. | 10-3 |
| B. | 10-10 |
| C. | 10-11 |
| D. | 10-13 |
| Answer» D. 10-13 | |
| 336. |
Which of the following ratios defines the recycle ratio in a chemical process? |
| A. | Gross feed stream/recycle feed stream |
| B. | Recycle stream/fresh feed stream |
| C. | Recycle stream/gross feed stream |
| D. | None of these |
| Answer» C. Recycle stream/gross feed stream | |