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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.
| 651. |
The heat evolved in the combustion of benzene is represented by the equation:     C6H6 + 7.5 O2 = 6CO2 + 3H2O, ΔH = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C6H6 is burnt in an open container, will be __________ kJ/kgmole. |
| A. | 816.15 |
| B. | 1632.3 |
| C. | -1632.3 |
| D. | -2448.45 |
| Answer» D. -2448.45 | |
| 652. |
One 'Therm' is equivalent to |
| A. | 105 BTU |
| B. | 105 kcal |
| C. | 109 BTU |
| D. | 109 kcal |
| Answer» B. 105 kcal | |
| 653. |
Gases diffuse faster compared to liquids because of the reason that the liquid molecules |
| A. | are held together by stronger inter-molecular forces. |
| B. | move faster. |
| C. | have no definite shape. |
| D. | are heavier |
| Answer» B. move faster. | |
| 654. |
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 | |
| 655. |
For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction). |
| A. | inversely |
| B. | exponentially |
| C. | linearly |
| D. | negligibly |
| Answer» D. negligibly | |
| 656. |
The average value of heat of neutralisation of dilute solution of strong acids and strong bases is about __________ kcal/kg.mole of water formed. |
| A. | 6680 |
| B. | 13360 |
| C. | 2481 |
| D. | 97302 |
| Answer» C. 2481 | |
| 657. |
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. | 43497 |
| B. | 43525 |
| C. | 43556 |
| D. | 43526 |
| Answer» C. 43556 | |
| 658. |
Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ? |
| A. | ΔH = 1 (+ ve)and Δ V = -ve |
| B. | ΔH = 0 |
| C. | ΔV = 0 |
| D. | both (b) and (c) |
| Answer» E. | |
| 659. |
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 | |
| 660. |
Heat of solution in a system in which both solute and solvent are liquids is termed as |
| A. | heat of solvation. |
| B. | heat of hydration. |
| C. | standard integral heat of solution. |
| D. | heat of mixing. |
| Answer» E. | |
| 661. |
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 | |
| 662. |
Average molecular weight of air is about |
| A. | 21 |
| B. | 29 |
| C. | 23 |
| D. | 79 |
| Answer» C. 23 | |
| 663. |
Atoms of the same element, but of different masses are called |
| A. | isobars |
| B. | isotones |
| C. | isotopes |
| D. | none of these |
| Answer» D. none of these | |
| 664. |
pH value of a solution containing 1 gm of hydrogen ion per litre will be |
| A. | 0 |
| B. | 1 |
| C. | 7 |
| D. | 10 |
| Answer» B. 1 | |
| 665. |
Colligative properties of a dilute solution are those, which depend entirely upon the |
| A. | chemical composition of the solute. |
| B. | constitution of the solute. |
| C. | number of solute molecules contained in a given volume of the solvent. |
| D. | none of these. |
| Answer» C. number of solute molecules contained in a given volume of the solvent. | |
| 666. |
Osmotic pressure of the solution can be increased by |
| A. | decreasing its temperature. |
| B. | increasing the volume of the vessel containing the solution. |
| C. | diluting the solution. |
| D. | none of these. |
| Answer» E. | |
| 667. |
Cp equals Cv at |
| A. | 0°C |
| B. | 0°K |
| C. | 0°F |
| D. | 0°R |
| Answer» C. 0¬∞F | |
| 668. |
Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components. |
| A. | lower than |
| B. | higher than |
| C. | equal to |
| D. | either (a) or (b); depends on the liquids |
| Answer» B. higher than | |
| 669. |
Elements in a periodic table are arranged in order of their |
| A. | atomic number. |
| B. | mass number. |
| C. | atomic weight. |
| D. | metallic characteristics. |
| Answer» B. mass number. | |
| 670. |
Which of the following is insensitive to changes in pressure ? |
| A. | Heat of vaporisation |
| B. | Melting point |
| C. | Heat of fusion |
| D. | Both (b) and (c) |
| Answer» E. | |
| 671. |
In a binary liquid system, the composition expressed as __________ is independent of the temperature & pressure. |
| A. | kg of solute/kg of solvent |
| B. | kg-mole of solute/kg-mole of solvent |
| C. | kg-mole of solute/1000 kg of solvent |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 672. |
Gases having same reduced temperatures and reduced pressures |
| A. | deviate from ideal gas behaviour to the same degree. |
| B. | have nearly the same compressibility factor. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 673. |
Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 674. |
A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is |
| A. | 2 |
| B. | 1 |
| C. | 0.5 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 675. |
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 | |
| 676. |
Solutions which distil without change in composition are called |
| A. | ideal |
| B. | saturated |
| C. | supersaturated |
| D. | azeotropic |
| Answer» E. | |
| 677. |
1 kgf/cm2 is not equal to |
| A. | 1 torr |
| B. | 1 bar |
| C. | 10000 mm wc |
| D. | 100 KPa = 100 000 N/m2 |
| Answer» B. 1 bar | |
| 678. |
Colligative properties of a dilute solution are those which depend entirely upon the |
| A. | constitution of the solute. |
| B. | chemical composition of the solute. |
| C. | number of solute molecules contained in a given volume of the solvent. |
| D. | none of these. |
| Answer» B. chemical composition of the solute. | |
| 679. |
Molar heat capacity of water in equilibrium with ice at constant pressure is |
| A. | 0 |
| B. | ‚àû |
| C. | 1 |
| D. | none of these |
| Answer» C. 1 | |
| 680. |
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. Mole fraction of water vapour in the product gases is about |
| A. | 0.19 |
| B. | 0.33 |
| C. | 0.4 |
| D. | 0.67 |
| Answer» B. 0.33 | |
| 681. |
S.T.P. corresponds to |
| A. | 1 atm. absolute pressure & 15.5°C. |
| B. | 760 mm Hg gauge pressure & 15.5°C. |
| C. | 760 torr & 0°C. |
| D. | 101.325 kPa gauge pressure & 15.5°C. |
| Answer» B. 760 mm Hg gauge pressure & 15.5¬∞C. | |
| 682. |
The evaporation of aqueous solution of sugar causes its molarity to |
| A. | decrease. (b) increase. |
| B. | remain unchanged. |
| C. | either (a) or (b); depends on the concentration of the solution. |
| D. | |
| Answer» C. either (a) or (b); depends on the concentration of the solution. | |
| 683. |
Which of the following is not a unit of pressure ? |
| A. | Torr |
| B. | Newton/m2 |
| C. | Parsec |
| D. | Ata, bar or pascal |
| Answer» D. Ata, bar or pascal | |
| 684. |
One Newton is equal to __________ dynes. |
| A. | 102 |
| B. | 103 |
| C. | 104 |
| D. | 105 |
| Answer» E. | |
| 685. |
No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules |
| A. | collide without loss of energy. |
| B. | do work equal to loss in kinetic energy. |
| C. | are above the inversion temperature. |
| D. | exert no attractive force on each other. |
| Answer» D. exert no attractive force on each other. | |
| 686. |
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 |
| B. | 0.065 |
| C. | 0.1 |
| D. | 1 |
| Answer» C. 0.1 | |
| 687. |
Which of the following is not a colligative property ? |
| A. | Osmotic pressure |
| B. | Depression of freezing point |
| C. | Lowering of vapor pressure |
| D. | none of these. |
| Answer» E. | |
| 688. |
The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour |
| A. | measures the elevation in boiling point. |
| B. | is not dependent on the temperature. |
| C. | is a function of the liquid phase composition. |
| D. | measures the depression in freezing point. |
| Answer» D. measures the depression in freezing point. | |
| 689. |
CaCO3 contains __________ percent of Ca by weight. |
| A. | 40 |
| B. | 48 |
| C. | 96 |
| D. | 12 |
| Answer» B. 48 | |