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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 5351. |
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. H 298 = - 730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in C would be approximately equal to |
| A. | 1225 |
| B. | 1335 |
| C. | 1525 |
| D. | 1735 |
| Answer» E. | |
| 5352. |
As per Kirchoff s equation, the heat of reaction is affected by the |
| A. | pressure |
| B. | volume |
| C. | temperature |
| D. | molecularity |
| Answer» D. molecularity | |
| 5353. |
Na2SO4. 10H2O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na2SO4. The final concentration of the solute in the solution is 10%. The weight of crystals is |
| A. | 20 |
| B. | 32.2 |
| C. | 45.35 |
| D. | 58.65 |
| Answer» E. | |
| 5354. |
Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ? |
| A. | Chlorine |
| B. | Nitrogen |
| C. | Ethane |
| D. | All the gases will have the same KE |
| Answer» E. | |
| 5355. |
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 |
| E. | <img src="/_files/images/chemical-engineering/stoichiometry/85-273-1.png"> |
| Answer» C. 1/2 | |
| 5356. |
On mixing 56 gm of CaO with 63 gm of HNO3, the amount of Ca(NO3)2 formed is __________ gm. |
| A. | 82 |
| B. | 164 |
| C. | 41 |
| D. | 8.2 |
| Answer» B. 164 | |
| 5357. |
The pressure under which liquid and vapor can co-exit at equilibrium is called the __________ vapor pressure. |
| A. | limiting |
| B. | real |
| C. | saturated |
| D. | normal |
| Answer» D. normal | |
| 5358. |
__________ chart is a graph related to Antonie equation. |
| A. | Ostwald |
| B. | Cox |
| C. | Mollier's |
| D. | Enthalpy-concentration |
| Answer» C. Mollier's | |
| 5359. |
Degrees of freedom will be equal to the number of components for a system comprising of |
| A. | only soluble liquid components. |
| B. | partially miscible two liquid components system having two phases. |
| C. | two liquid components and one solute (soluble in both the liquids). |
| D. | none of these. |
| Answer» B. partially miscible two liquid components system having two phases. | |
| 5360. |
A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container |
| A. | will be greater than 298 K. |
| B. | will be 298 K. |
| C. | will be less than 298 K. |
| D. | can not be determined. |
| Answer» D. can not be determined. | |
| 5361. |
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 | |
| 5362. |
The most convenient way of expressing solution concentration is in terms of |
| A. | mole fraction |
| B. | normality |
| C. | molality |
| D. | molarity |
| Answer» E. | |
| 5363. |
Raoult's law is not applicable to the |
| A. | solutes which dissociate or associate in the particular solution. |
| B. | concentrated solutions. |
| C. | both(b)&(c) |
| D. | solutions containing non-volatile solute. |
| Answer» D. solutions containing non-volatile solute. | |
| 5364. |
The atomic heat capacities of all solid elements __________ with decrease in temperature. |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | approach zero at 0 C |
| Answer» C. remains unchanged | |
| 5365. |
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. | |
| 5366. |
API gravity of water at N.T.P. is about |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| Answer» D. 100 | |
| 5367. |
"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 | |
| 5368. |
The osmotic pressure of a solution is directly proportional to the |
| A. | lowering of vapor pressure. |
| B. | molecular concentration of the solute. |
| C. | absolute temperature of a given concentration. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 5369. |
The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen. |
| A. | lower than |
| B. | higher than |
| C. | same as |
| D. | not related to |
| Answer» B. higher than | |
| 5370. |
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's law of constant heat summation |
| Answer» E. | |
| 5371. |
Which of the following expressions defines the Baume gravity scale for liquids lighter than water ? |
| A. | Be = (140/G) - 130 |
| B. | Be = 200(G-1) |
| C. | Be = 145 - (145/G) |
| D. | Be = (400/G) - 400 |
| Answer» B. Be = 200(G-1) | |
| 5372. |
2 litres of nitrogen at N.T.P. weighs __________ gms. |
| A. | 14 |
| B. | 2.5 |
| C. | 28 |
| D. | 1.25 |
| Answer» C. 28 | |
| 5373. |
Which of the following is followed by an ideal solution ? |
| A. | Boyle's law |
| B. | Amgat's law |
| C. | Raoult's law |
| D. | Trouton's rule |
| Answer» D. Trouton's rule | |
| 5374. |
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 | |
| 5375. |
The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to |
| A. | 1.5 |
| B. | 15 |
| C. | 150 |
| D. | 1500 |
| Answer» E. | |
| 5376. |
The heat of vaporisation __________ with increase in pressure. |
| A. | increases |
| B. | decreases |
| C. | becomes zero at critical pressure |
| D. | both (b) and (c) |
| Answer» E. | |
| 5377. |
In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality? |
| A. | Use of equation of state |
| B. | Fugacity co-efficient |
| C. | Activity co-efficient |
| D. | None of these |
| Answer» D. None of these | |
| 5378. |
If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will |
| A. | be reduced to l/4th. |
| B. | increase four times. |
| C. | increase two times. |
| D. | none of these. |
| Answer» C. increase two times. | |
| 5379. |
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 | |
| 5380. |
The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg. ? |
| A. | 0.2 |
| B. | 0.1 |
| C. | 0.4 |
| D. | 0.6 |
| Answer» E. | |
| 5381. |
In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is |
| A. | independent of the temperature. |
| B. | increased with the increase in pressure. |
| C. | decreased with the increase in pressure. |
| D. | unchanged by the pressure change. |
| E. | none of these |
| Answer» D. unchanged by the pressure change. | |
| 5382. |
Molality is defined as the number of gm moles of solute per __________ of solvent. |
| A. | litre |
| B. | kg |
| C. | gm mole |
| D. | gm |
| Answer» C. gm mole | |
| 5383. |
Saturated molal absolute humidity of the vapor-gas mixture depends upon the |
| A. | vapor pressure at dry bulb temperature |
| B. | total pressure |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 5384. |
"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 | |
| 5385. |
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. | |
| 5386. |
1 ata is equivalent to |
| A. | 1 atm. |
| B. | 10 torr |
| C. | 0.98 Pascal |
| D. | 1 kgf/cm |
| E. | <sup>2</sup> |
| Answer» E. <sup>2</sup> | |
| 5387. |
Addition of a non-volatile solute to a solvent produces a __________ in its solvent. |
| A. | freezing point elevation |
| B. | boiling point depression |
| C. | vapor pressure lowering |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 5388. |
The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be |
| A. | basic |
| B. | more acidic |
| C. | neutral |
| D. | of the same acidity |
| Answer» B. more acidic | |
| 5389. |
Hess's law of constant heat summation is based on conservation of mass. It deals with |
| A. | equilibrium constant. |
| B. | reaction rate. |
| C. | changes in heat of reaction. |
| D. | none of these. |
| Answer» D. none of these. | |
| 5390. |
Percentage saturation of a vapor bearing gas is always __________ the relative saturation. |
| A. | higher than |
| B. | smaller than |
| C. | equal to |
| D. | either (a) or (b); depends on the system |
| Answer» C. equal to | |
| 5391. |
1 BTU/ft3 is approximately equal to __________ kcal/m3. |
| A. | 1 |
| B. | 9 |
| C. | 4 |
| D. | 252 |
| Answer» C. 4 | |
| 5392. |
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 | |
| 5393. |
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 | |
| 5394. |
NaOH contains __________ percent oxygen. |
| A. | 1 |
| B. | 10 |
| C. | 16 |
| D. | 40 |
| Answer» E. | |
| 5395. |
For estimation of heat capacity of a solid compound, one can use |
| A. | Clayperon's equation |
| B. | Gibb's equation |
| C. | Kopp's rule |
| D. | Trouton's rule |
| Answer» D. Trouton's rule | |
| 5396. |
With increase in the temperature of pure (distilled) water, its |
| A. | pOH decreases and pH increases. |
| B. | pOH and pH both 4ecreases. |
| C. | pH and pOH both increases. |
| D. | pH decreases and pOH increases. |
| Answer» C. pH and pOH both increases. | |
| 5397. |
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. | |
| 5398. |
1 torr is equal to __________ mm Hg column. |
| A. | 1 |
| B. | 0.1 |
| C. | 10 |
| D. | 1000 |
| Answer» B. 0.1 | |
| 5399. |
The temperature of a gas in a closed container is 27 C. If the temperature of the gas is incresed to 300 C, then the pressure exerted is |
| A. | doubled. |
| B. | halved. |
| C. | trebled. |
| D. | unpredictable. |
| Answer» E. | |
| 5400. |
Isotonic solutions must have the same |
| A. | viscosity |
| B. | molar concentration |
| C. | normality |
| D. | critical temperature |
| Answer» C. normality | |