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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.
| 351. |
Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pvB and pvw respectively. The partial pressure of benzene in air-vapour mixture is |
| A. | PvB |
| B. | xB.PvB |
| C. | (Patm - Pvw)xB |
| D. | xB.Patm |
| Answer» C. (Patm - Pvw)xB | |
| 352. |
Real gases approach ideal behaviour at |
| A. | high pressure & high temperature. |
| B. | low pressure & high temperature. |
| C. | high pressure & low temperature. |
| D. | low pressure & low temperature. |
| Answer» C. high pressure & low temperature. | |
| 353. |
Normality of a solution does not change with the increase in the |
| A. | pressure |
| B. | temperature |
| C. | solute concentration |
| D. | dilution of the solution |
| Answer» B. temperature | |
| 354. |
Number of gram equivalent of solute dissolved in one litre of solution is called its |
| A. | normally |
| B. | molarity |
| C. | molality |
| D. | formality |
| Answer» B. molarity | |
| 355. |
Pick out the wrong unit conversion of heat transfer co-efficient. |
| A. | 1 kcal/m2.hr.°C = 0.2048 BTU/ft2.hr. °F. = 1.163 W/m2.°K |
| B. | 1 kcal/m2.hr.°K = 1.163 W/m2.°C |
| C. | 1 W/m2 . °C = 0.1761 BTU/ft2.hr.°F. |
| D. | 1 BTU/ft2.hr.°F = 4.88 kcal/m2.hr.°C = 20.44 kJ/m2.hr°C = 5.678 W/m2.°C. |
| Answer» C. 1 W/m2 . ¬∞C = 0.1761 BTU/ft2.hr.¬∞F. | |
| 356. |
A bypass stream in a chemical process is useful, because it |
| A. | facilitates better control of the process. |
| B. | improves the conversion. |
| C. | increases the yield of products. |
| D. | none of these. |
| Answer» B. improves the conversion. | |
| 357. |
If the partial pressure of the solvent in the vapor phase is equal to the vapor pressure of the solvent at that temperature, then the system is said to be at its |
| A. | bubble point. |
| B. | saturation temperature. |
| C. | dew point. |
| D. | both (b) and (c). |
| Answer» E. | |
| 358. |
1 torr is equal to __________ mm Hg column. |
| A. | 1 |
| B. | 0.1 |
| C. | 10 |
| D. | 1000 |
| Answer» B. 0.1 | |
| 359. |
2 litres of nitrogen at N.T.P. weighs __________ gms. |
| A. | 14 |
| B. | 2.5 |
| C. | 28 |
| D. | 1.25 |
| Answer» C. 28 | |
| 360. |
__________ chart is a graph related to Antonie equation. |
| A. | Ostwald |
| B. | Cox |
| C. | Mollier's |
| D. | Enthalpy-concentration |
| Answer» C. Mollier's | |
| 361. |
A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of |
| A. | 3 |
| B. | 100 |
| C. | 1000 |
| D. | none of these |
| Answer» D. none of these | |
| 362. |
Heat of neutralisation of HCl and NaOH is - 57.46 kJ/Kg mole. The heat of ionisation of water will be __________ kJ/Kg mole. |
| A. | 57.46 |
| B. | -57.46 |
| C. | 114.92 |
| D. | -28.73 |
| Answer» B. -57.46 | |
| 363. |
"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 | |
| 364. |
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 Bis |
| A. | 1.25 |
| B. | 1.3 |
| C. | 1.35 |
| D. | 1.2 |
| Answer» E. | |
| 365. |
The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases. |
| A. | potential energy |
| B. | intermolecular forces |
| C. | kinetic energy |
| D. | total energy |
| Answer» D. total energy | |
| 366. |
Enthalpy of formation of NH3 is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 ‚Üí N2 + 3H2, is equal to __________ kJ/kg. mole.$ |
| A. | 46 |
| B. | 92 |
| C. | -23 |
| D. | -92 |
| Answer» C. -23 | |
| 367. |
Cp/Cv for monoatomic gases is |
| A. | 1.44 |
| B. | 1.66 |
| C. | 1.99 |
| D. | 1 |
| Answer» C. 1.99 | |
| 368. |
Unit of power is |
| A. | joule |
| B. | watt |
| C. | joule/Second |
| D. | both(b)&(c) |
| Answer» E. | |
| 369. |
A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is |
| A. | N2O4 |
| B. | N2O5 |
| C. | N2O3 |
| D. | none of these |
| Answer» C. N2O3 | |
| 370. |
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 | |
| 371. |
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 | |
| 372. |
The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is |
| A. | termed as relative saturation. |
| B. | not a function of the composition of gas mixture. |
| C. | called percentage saturation. |
| D. | not a function of the nature of vapor. |
| Answer» B. not a function of the composition of gas mixture. | |
| 373. |
An oxidation process is accompanied by decrease in the |
| A. | number of electrons. |
| B. | oxidation number. |
| C. | number of ions. |
| D. | all (a), (b) & (c). |
| Answer» B. oxidation number. | |
| 374. |
In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest ? |
| A. | 30 c.c acid and 30 c.c base. |
| B. | 20 c.c acid and 25 c.c base. |
| C. | 15 c.c acid and 35 c.c base. |
| D. | 35 c.c acid and 15 c.c base. |
| Answer» B. 20 c.c acid and 25 c.c base. | |
| 375. |
pH value of H2SO4 (5% concentration) is |
| A. | 5 |
| B. | 7 |
| C. | > 7 |
| D. | < 7 |
| Answer» E. | |
| 376. |
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 | |
| 377. |
The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state. |
| A. | less |
| B. | more |
| C. | same |
| D. | either (a) or (b); depends on the nature of the substance |
| Answer» D. either (a) or (b); depends on the nature of the substance | |
| 378. |
As per Kirchoff s equation, the heat of reaction is affected by the |
| A. | pressure |
| B. | volume |
| C. | temperature |
| D. | molecularity |
| Answer» D. molecularity | |
| 379. |
Cp 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 | |
| 380. |
Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at |
| A. | heat conservation. |
| B. | yield enhancement. |
| C. | product enrichment. |
| D. | none of these. |
| Answer» D. none of these. | |
| 381. |
NaOH contains __________ percent oxygen. |
| A. | 1 |
| B. | 10 |
| C. | 16 |
| D. | 40 |
| Answer» E. | |
| 382. |
Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume 'X' diffuses twice as fast as another perfume 'Y'; what is the molecular weight of 'Y', if the vapor density of gas 'X' is 2 ? Molecular weight of gas 'X' is to be assumed to be 2. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 383. |
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 (a), (b) & (c). |
| Answer» E. | |
| 384. |
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 | |
| 385. |
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 | |
| 386. |
The reaction A + B ‚Üí 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. | |
| 387. |
In osmosis through a semi-permeable membrane, diffusion of the |
| A. | solvent is from low concentration to high concentration region. |
| B. | solvent is from high concentration to low concentration region. |
| C. | solute takes place. |
| D. | none of these. |
| Answer» B. solvent is from high concentration to low concentration region. | |
| 388. |
1 gm mole of an alcohol whose molecular weight is 74 contains 48 gms of carbon, 10 gms of hydrogen and 16 gms of oxygen. Its molecular formula is |
| A. | C4H9OH |
| B. | C3H21OH |
| C. | (C2H4)2H2.OH |
| D. | C2H33OH |
| Answer» B. C3H21OH | |
| 389. |
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 | |
| 390. |
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. | |
| 391. |
One micron is equal to __________ cm. |
| A. | 43506 |
| B. | 43565 |
| C. | 43626 |
| D. | 43687 |
| Answer» C. 43626 | |
| 392. |
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. | |
| 393. |
The vapour pressure of a solution (made by dissolving a solute in a solvent) is __________ that of the pure solvent. |
| A. | less than |
| B. | more than |
| C. | equal to |
| D. | either more or less; depends on the solvent |
| Answer» B. more than | |
| 394. |
The temperature at which a real gas obeys Boyle's law is termed as the |
| A. | triple point |
| B. | Boyle's temperature |
| C. | eutectic point |
| D. | inversion temperature |
| Answer» C. eutectic point | |
| 395. |
"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 | |
| 396. |
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. | |
| 397. |
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 | |
| 398. |
The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the |
| A. | relative humidity. |
| B. | relative saturation. |
| C. | percentage saturation. |
| D. | none of these. |
| Answer» D. none of these. | |
| 399. |
The elevation in boiling point of a solution is proportional to the __________ of the solution. |
| A. | molal concentration |
| B. | reciprocal of the molal concentration |
| C. | normality |
| D. | molarity |
| Answer» B. reciprocal of the molal concentration | |
| 400. |
The most convenient way of expressing solution concentration is in terms of |
| A. | mole fraction |
| B. | normality |
| C. | molality |
| D. | molarity |
| Answer» E. | |