chemical engineering MCQs – Page 435

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

8681. With increase in the temperature of pure (distilled) water, its____________________?
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A. pOH decreases and pH increases

B. pOH and pH both decreases

C. pH and pOH both increases

D. pH decreases and pOH increases

8682. In a binary liquid system, the composition expressed as _______________ is independent of the temperature & pressure?
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A. Kg-mole of solute/kg-mole of solvent

B. All A., B. & C.

C. Kg-mole of solute/1000 kg of solvent

D. Kg of solute/kg of solvent

8683. 1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?
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A. 20

B. 10

C. 15

D. 5

8684. 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_____________________?
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A. Relative humidity

B. None of these

C. Percentage saturation

D. Relative saturation

8685. Pick out the correct statement ?
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A. For the reaction, PCl5 ? PCl3 + Cl2, ?G is less than ?E

B. The heating of water in a beaker is an example of an isolated system

C. At equilibrium, ?G is zero

D. Heat of solution is always positive

8686. pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________?
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A. 0

B. 10

C. 7

D. 14

8687. 6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be ______________ gm?
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A. 5

B. 1

C. 0.5

D. 3

8688. 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___________________?
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A. Nature of the gas

B. Nature of the liquid

C. Total pressure

D. Temperature of the liquid

8689. The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is_________________?
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A. 0.2

B. 0.6

C. 0.8

D. 0.4

8690. A very dilute solution is prepared by dissolving x1 mole of solute in x2 mole of a solvent. The mole fraction of solute is approximately equal to_________________?
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A. 1 (x1/x2)

B. x1/x2

C. 1/x2

D. x2/x1

8691. In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is__________________?
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A. 720

B. 180

C. 200

D. 60.3

8692. 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 ?
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A. 35 c.c acid and 15 c.c base

B. 30 c.c acid and 30 c.c base

C. 20 c.c acid and 25 c.c base

D. 15 c.c acid and 35 c.c base

8693. 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 500C to 100C is ____________________?
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A. 18.33 kJ

B. 16.15 kJ

C. 10.73 kJ

D. 18.11 kJ

8694. Which of the following has the smallest least effect on the solubility of a solute into the solvent ?
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A. Nature of the solute

B. Nature of the solvent

C. Pressure

D. Temperature

8695. With increase in the solute concentration, the specific heat of aqueous solutions _____________________?
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A. Remains unchanged

B. Increases

C. Decreases

D. Either A. or B.; depends on the type of solution

8696. Pick out the correct statement?
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A. put of work

B. Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work

C. Efficiency of an Otto engine is higher than that of a diesel engine for the same compression

D. Diesel engine normally operates at lower compression ratio than an Otto engine for an equal

E. duced per quantity of heat

F. io</strong>

8697. According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?
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A. T0.5

B. T2

C. T

D. T1.5

8698. In a chemical process, the recycle stream is purged for______________________?
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A. Limiting the inerts

B. Increasing the product yield

C. Heat conservation

D. Enriching the product

8699. The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be______________?
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A. More acidic

B. Basic

C. Neutral

D. Of the same acidity

8700. Pick out the wrong statement?
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A. The value of Cp at critical temperature and pressure reaches infinity

B. The value of Cp of gases increases with increase in pressure, above atmospheric pressure

C. All A., B., and C.

D. critical temperature is negligible</strong>

E. The effect of pressure on heat capacity of gases at pressure above one atmosphere and above

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