chemical engineering stoichiometry MCQs – Page 14

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 Review each marked answer and report any item that may be outdated or unclear.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
261. Pick out the wrong unit conversion ?
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A. 1 kPa = 100 bar

B. None of these

C. 1 mm Hg = 1 torr = 133.3 Pa

D. 1 atm. = 760 mm Hg = 29.92 inch Hg = 14.7 psi = 1.013 bar = 1.013 kgf/cm2

262. The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be _____________ times?
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A. 4

B. ?2

C. 2-Jan

D. 4-Jan

263. The chemical nature of an element is independent of_______________________?
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A. Its atomic number

B. The number of neutrons present in it

C. The number of protons or electrons present in it

D. None of these

264. If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will_________________?
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A. Increase four times

B. Increase two times

C. Be reduced to 1/4th

D. None of these

265. pH value of a solution containing 1 gm of hydrogen ion per litre will be ____________________?
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A. 7

B. 1

C. 0

D. 10

266. The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal _____________ in the two phases?
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A. Total energy

B. Kinetic energy

C. Potential energy

D. Intermolecular forces

267. A chemical process is said to occur under unsteady state, if the_________________?
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A. Inventory changes do not take place

B. Ratio of streams entering/leaving are independent of time

C. Flow rates & composition both are time dependent

D. None of these

268. For most salts, the solubility increases with rise in temperature, but the solubility of _______________ is nearly independent of temperature rise?
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A. Hypo

B. Sodium chloride

C. Anhydrous sodium sulphate

D. Sodium carbonate monohydrate

269. 500 c.c. each of hydrogen at 700 mm Hg pressure and oxygen at 600 mm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be _____________ mm Hg?
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A. 700

B. 375

C. 600

D. 650
270. Kinetic theory of gases stipulates that, the____________________?
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A. Energy is lost during molecular collisions

B. Absolute temperature is a measure of the kinetic energy of molecules

C. Molecules possess appreciable volume

D. None of these

271. For the gaseous phase reaction, N2 + O2 ? 2NO, ?H = + 80 kJ/kg. mole; the decomposition of NO is favoured by____________________?
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A. Decrease in temperature

B. Increasing the concentration of N2

C. Increase in pressure

D. Decrease in pressure

272. Pick out the correct statement ?
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A. Heat added to or given up by a substance at constant temperature is called the sensible heat

B. A mixture of vapor gas is called saturated, if the equilibrium vapor pressure of the liquid is

C. e than the partial pressure of the vapor at the same temperature

D. A substance existing above its critical temperature is called a saturated vapor

E. The end points of a vapor-pressure vs. temperature curve are critical and triple points
273. Pick out the wrong statement?
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A. The evaporation of aqueous solution of glucose causes its molarity to increase

B. Both the freezing point as well as boiling point of sea water is more than that of distilled water

C. The solution containing equal masses of two liquids X and Y has the same mole fraction of

D. 216;X and Y

E. Both B. and C.
274. 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. Total pressure

B. Temperature of the liquid

C. Nature of the liquid

D. Nature of the gas
275. _____________ fuels require the maximum percentage of excess air for complete combustion ?
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A. Nuclear

B. Solid

C. Liquid

D. Gaseous

276. At higher temperatures, molal heat capacities for most of the gases (at constant pressure) _______________ with increase in temperature?
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A. Increases

B. Decreases

C. Varies linearly

D. Does not vary

277. The density of a gas X is twice that of another gas Y. If the molecular weight of gas Y is M; then the molecular weight of the gas X will be________________?
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A. 2M

B. M/2

C. M

D. M/4

278. With increase in the solute concentration, the specific heat of aqueous solutions _____________________?
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A. Increases

B. Remains unchanged

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

D. Decreases
279. The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ?H = 394 kJ/kg .mole CO + O2 = CO2, ?H = 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?
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A. 180

B. -109.5

C. 109.5

D. 100

280. 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. Relative saturation

D. Percentage saturation