chemical engineering stoichiometry MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering stoichiometry Mcqs
341. Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?
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A. Vapor pressure lowering

B. All A., B. & C.

C. Freezing point elevation

D. Boiling point depression

342. Molar heat capacity of water in equilibrium with ice at constant pressure is_____________________?
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A. 1

B. ?

C. None of these

D. 0

343. At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?
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A. 6

B. 8

C. 10

D. 12

344. What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20) ?
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A. A2B3

B. A2B

C. AB2

D. AB3
345. Boiling point of a solution as compared to that of the corresponding solvent is _________________?
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A. Same

B. Either more or less; depends upon the solvent

C. Less

D. More
346. 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?
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A. 0

B. 16

C. 44

D. 1

347. Normality of a solution does not change with the increase in the __________________?
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A. Dilution of the solution

B. Solute concentration

C. Pressure

D. Temperature

348. The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?
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A. Increases with pressure rise

B. Decreases with increasing pressure

C. Becomes zero at the critical point

D. Both B. & C.
349. In a chemical process, the recycle stream is purged for______________________?
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A. Increasing the product yield

B. Limiting the inerts

C. Heat conservation

D. Enriching the product

350. The temperature of a gas in a closed container is 27 C. If the temperature of the gas is increased to 300 C, then the pressure exerted is___________________?
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A. Unpredictable

B. Doubled

C. Trebled

D. Halved

351. 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. 5

C. 15

D. 10
352. Average molecular weight of air is about ____________________?
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A. 29

B. 21

C. 79

D. 23

353. 80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is_________________?
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A. 0

B. 0.24

C. 1

D. 0.18
354. Gases having same reduced temperatures and reduced pressures_________________?
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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.

355. How much O2 can be obtained from 90 kg of water ?
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A. 80 kg

B. 90 kg

C. 32 kg

D. 64 kg

356. The heat capacity of most substances is greater for the _______________ state?
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A. Solid

B. Liquid

C. None of these

D. Gaseous

357. Density of carbon dioxide is _________________ kg/Nm3 ?
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A. 22.4/44

B. 44/22400

C. 44/22.4

D. None of these

358. Pick out the wrong statement ?
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A. Reduced temperature of a substance is the ratio of its existing temperature to its critical temperature, both expressed on Celsius scale

B. Reduced pressure is the ratio of the existing pressure of a substance to its critical pressure

C. Reduced volume is the ratio of the existing molal volume of a substance to its critical molal volume

D. None of these

359. Recycling in a chemical process facilitates___________________?
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A. Enrichment of product

B. Heat conservation

C. Increased yield

D. All A., B. & C.
360. 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________________?
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A. Complete wetting

B. Wetting

C. Mixing

D. Adsorption