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.
| 451. |
The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is __________ kg mole. |
| A. | 1 |
| B. | 0 |
| C. | 16 |
| D. | 44 |
| Answer» C. 16 | |
| 452. |
The value of Trouton's ratio (λb/Tb) for a number of substances is 21 (where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids.$ |
| A. | polar |
| B. | non-polar |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 453. |
Kinematic viscosity of 1 m2 /second is equivalent to __________ stokes. |
| A. | 10 |
| B. | 102 |
| C. | 103 |
| D. | 104 |
| Answer» E. | |
| 454. |
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 | |
| 455. |
If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will |
| A. | remain unaltered |
| B. | increase nine fold |
| C. | increase three fold |
| D. | decrease three fold |
| Answer» C. increase three fold | |
| 456. |
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 | |
| 457. |
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 | |
| 458. |
Internal energy of a substance comprises of the __________ energy. |
| A. | vibrational |
| B. | rotational |
| C. | translational |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 459. |
Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the |
| A. | recycling |
| B. | purging |
| C. | bypassing |
| D. | recirculation |
| Answer» C. bypassing | |
| 460. |
Two solutions A1 and A2 have pH value of 2 and 6 respectively. It implies that the solution |
| A. | A2 is more alkaline than solution A2 |
| B. | A1 is highly acidic. |
| C. | A1 is very slightly acidic. |
| D. | both (a) &(c). |
| Answer» E. | |
| 461. |
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 | |
| 462. |
An azeotropic solution of two liquids has boiling point lower than either of them, when it |
| A. | is saturated. |
| B. | is unsaturated. |
| C. | shows negative deviation from Raoult's law. |
| D. | shows positive deviation from Raoult's law. |
| Answer» E. | |
| 463. |
Which of the following ideal gas laws are not applicable to mixture of gases ? |
| A. | Amgat's law |
| B. | Dalton's law |
| C. | Boyle's law & Charle's Law |
| D. | none of these |
| Answer» D. none of these | |
| 464. |
Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the |
| A. | vapor follows the ideal gas law. |
| B. | molal latent heat of vaporisation is constant within the limited temperature range. |
| C. | volume in the liquid state is negligible compared with that in the vapor state. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 465. |
Isotonic solutions must have the same |
| A. | viscosity |
| B. | molar concentration |
| C. | normality |
| D. | critical temperature |
| Answer» C. normality | |
| 466. |
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 | |
| 467. |
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. | |
| 468. |
Which of the following expressions defines the Baume gravity scale for liquids heavier than water ? |
| A. | (141.5/G) - 131.5 |
| B. | 145 - (145/G) |
| C. | 200(G-1) |
| D. | (400/G) - 400 |
| Answer» C. 200(G-1) | |
| 469. |
Isotopes are atoms having the same |
| A. | mass number |
| B. | number of neutrons |
| C. | atomic mass |
| D. | none of these |
| Answer» E. | |
| 470. |
Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is |
| A. | 1.72 |
| B. | 0.58 |
| C. | 0.5 |
| D. | 0.2 |
| Answer» C. 0.5 | |
| 471. |
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 | |
| 472. |
The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 x __________ |
| A. | 1026 |
| B. | 1023 |
| C. | 1020 |
| D. | 1019 |
| Answer» D. 1019 | |
| 473. |
Dry air is a mixture of |
| A. | vapors |
| B. | gases |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 474. |
1 kg/m2 is equal to __________ mm water column. |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 10 | |
| 475. |
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition. |
| A. | No component is concentrated at the surface of the solution. |
| B. | The component molecules are non polar and are of almost equal size. |
| C. | In the formation of solution, chemical combination/molecular association between unlike molecules takes place. |
| D. | The attractive forces between like and unlike molecules are almost equal. |
| Answer» D. The attractive forces between like and unlike molecules are almost equal. | |
| 476. |
The viscosity of water at room temperature may be around one |
| A. | centipoise |
| B. | poise |
| C. | stoke |
| D. | both (b) &(c) |
| Answer» B. poise | |
| 477. |
A gaseous mixture contains 14 kg of N2, 16 kg of O2 and 17 kg of NH3. The mole fraction of oxygen is |
| A. | 0.16 |
| B. | 0.33 |
| C. | 0.66 |
| D. | 0.47 |
| Answer» C. 0.66 | |
| 478. |
'Giga' stands for |
| A. | 109 |
| B. | 43809 |
| C. | 1012 |
| D. | 1015 |
| Answer» B. 43809 | |
| 479. |
A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor. |
| A. | saturated |
| B. | supersaturated |
| C. | superheated |
| D. | none of these |
| Answer» D. none of these | |
| 480. |
The hydroxyl ion (OH-) concentration in a solution having pH value 3 will be |
| A. | 43779 |
| B. | 43748 |
| C. | 43534 |
| D. | 43565 |
| Answer» B. 43748 | |
| 481. |
Mass number of an atom is the sum of the numbers of |
| A. | neutrons and protons |
| B. | protons and electrons |
| C. | neutrons and electrons |
| D. | both(a)&(b) |
| Answer» E. | |
| 482. |
How much O2 can be obtained from 90 kg of water ? |
| A. | 32 kg |
| B. | 80 kg |
| C. | 64 kg |
| D. | 90 kg |
| Answer» C. 64 kg | |
| 483. |
Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly the same. |
| A. | compressibility |
| B. | molecular weight |
| C. | humidity |
| D. | none of these |
| Answer» B. molecular weight | |
| 484. |
A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be$ |
| A. | -136.5°C |
| B. | - 136.5°K |
| C. | -273°C |
| D. | 0°K |
| Answer» B. - 136.5¬∞K | |
| 485. |
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 | |
| 486. |
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 | |
| 487. |
The value of the gas-law constant 'R' is 1.987 |
| A. | kcal/kg-mole.°C |
| B. | Btu/lb-mole.°R |
| C. | kcal/kg-mole.°K |
| D. | both (b)& (c) |
| Answer» E. | |
| 488. |
Solutions having the same osmotic pressure are called __________ solutions. |
| A. | dilute |
| B. | ideal |
| C. | isotonic |
| D. | saturated |
| Answer» D. saturated | |
| 489. |
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¬∞K | |
| 490. |
Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of |
| A. | mixing |
| B. | adsorption |
| C. | wetting |
| D. | complete wetting |
| Answer» E. | |
| 491. |
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 |
| C. | 30.6 |
| D. | 32.6 |
| Answer» D. 32.6 | |
| 492. |
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. | |
| 493. |
For a given mass of a gas at constant temperature, if the volume 'V' becomes three times, then the pressure 'P' will become |
| A. | P/3 |
| B. | 3P |
| C. | 9P2 |
| D. | 9P |
| Answer» B. 3P | |
| 494. |
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. | |
| 495. |
°API gravity of water at N.T.P. is about$ |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| Answer» D. 100 | |
| 496. |
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 | |
| 497. |
Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces ? |
| A. | RT |
| B. | |
| C. | (V - b) |
| Answer» B. | |
| 498. |
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. 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. | |
| 499. |
Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the |
| A. | nature of the liquid. |
| B. | nature of the gas. |
| C. | temperature of the liquid. id) total pressure. |
| Answer» C. temperature of the liquid. id) total pressure. | |
| 500. |
Roult's law is obeyed by a __________ solution. |
| A. | saturated |
| B. | molar |
| C. | normal |
| D. | none of these |
| Answer» E. | |