chemical engineering stoichiometry MCQs – Page 13

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 Review each marked answer and report any item that may be outdated or unclear.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

241. A butane isomerisation process produces 70 k.mole/hr of pure iso-butane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be_________________?
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A. 4 kmole/hr

B. 5 kmole/hr

C. 3 kmole/hr

D. 6 kmole/hr

242. A rigid vessel containing three moles of nitrogen gas at 30C is heated to 250C. 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__________________?
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A. 4576 J

B. 12712 J

C. 13728 J

D. 19206 J

243. Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?
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A. (Patm Pvw)xB

B. PvB

C. xB.PvB

D. xB.Patm

244. Vapor pressure of water at 100C is about _______________ bar?
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A. 10.13

B. 101.3

C. 0.1013

D. 1.013

245. Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because_________________?
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A. The strong base and strong acid reacts in aqueous solution

B. The strong base and strong acid reacts completely

C. The salt formed does not hydrolyse

D. Only OH- and H+ ions react in every case

246. Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?
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A. Chlorine

B. All the gases will have the same KE

C. Nitrogen

D. Ethane

247. The depression in freezing point of a solution is________________?
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A. Inversely proportional to the mass of solvent

B. Directly proportional to the mole of solute

C. Both A. and B.

D. Neither A. nor B.

248. Which of the following is followed by an ideal solution ?
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A. Troutons rule

B. Boyles law

C. Amagats law

D. Raoults law

249. In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is__________________?
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A. Decreased with the increase in pressure

B. Unchanged by the pressure change

C. Independent of the temperature

D. Increased with the increase in pressure

250. The most convenient way of expressing solution concentration is in terms of___________________?
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A. Normality

B. Mole fraction

C. Molality

D. Molarity

251. Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ?
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A. Pressure

B. Nature of solute

C. Nature of solvent

D. Temperature

252. Atmospheric pressure corresponds to a hydrostatic head of_________________?
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A. 1 metre of H2O

B. 13.6 cms of Hg

C. 13.6 metres of Hg

D. 34 ft ofH2O

253. Number of gm moles of solute dissolved in one liter of a solution is called its____________________?
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A. Normality

B. Molality

C. Molarity

D. Equivalent weight

254. What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25C ?
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A. 2-Jan

B. 1/3 (298/273)

C. 1/3

D. 3-Feb

255. Pick out the wrong statement?
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A. At the boiling point of liquid at the prevailing total pressure, saturated absolute humidity is infinite

B. Clausius-Clapeyron equation relates the latent heat of vaporisation to the slope of the vapor pressure curve

C. Percentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture

D. Clapeyron equation is given by dP/dT = (?/T) (VG VL); where, P = vapor pressure, T = absolute temperature, ? = latent heat of vaporisation, VG and VL = volumes of gas and liquid respectively

256. The equilibria relations in a multi-component and multiphase system cannot be calculated with the help of the_______________?
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A. Experimental data

B. Phase rule

C. Empirical equations

D. Theoretical equations

257. Pick out the wrong statement ?
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A. ionise

B. Raoults law holds good for the solubility of polar gases in non-polar liquids

C. Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do

D. Molecules with symmetrical arrangement (e.g., CH4 and CCl4) are non-polar

E. Most of the hydrocarbons are non-polar

258. The heat of solution depends upon the____________________?
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