chemical engineering stoichiometry MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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
281. A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct ?
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A. Xc > Xs

B. Xc < Xs

C. Xc = Xs

D. Xc greater/less than Xs depending on the length of the cylinder

282. Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0C will be _______________ atmosphere?
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A. 2

B. 1

C. 0.5

D. 1.5

283. With increase in temperature, the surface tension of water _____________________?
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A. Increases linearly

B. Remain constant

C. Decreases

D. Increases

284. Pick out the wrong unit conversion ?
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A. 1 ft.lbf= 0.3238 calorie = 0.1383 kg.m = 1.356 J = 1.356 N.m

B. 1 ton of TNT (tri-nitro-toluene) = 4.2 GJ (1G = 109)

C. 1 Joule = 4.186 calorie

D. 1 kcal = 3.968 BTU = 0.00116 kWh = 0.00156 hp

285. If a solution of eutectic composition is cooled, _______________ reaching the eutectic temperature ?
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A. None of these

B. The solvent begins to freeze out even before

C. It will not solidify even on

D. It will undergo no change until
286. A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO2, 0.05 gm mole of oxygen and 0.80 gm mole of N2. What is its molecular weight ?
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A. 30.6

B. 28.6

C. 30

D. 32.6

287. Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is___________________?
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A. 2-Jan

B. 9-Jan

C. 9-May

D. 8/9
288. Increasing the temperature of an aqueous solution will cause decrease in its________________?
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A. Molality

B. Mole fraction

C. Weight percent

D. Molarity
289. Pick out the wrong unit conversion of calorific value?
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A. 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3

B. 1 kcal/m3 = 0.1124 BTU/ft3

C. 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg

D. 1 BTU/lb = 2.3 kcal/kg
290. The temperature at which the second Virial co-efficient of a real gas is zero is called the_____________________?
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A. Critical temperature

B. Eutectic point

C. Boiling point

D. Boyle temperature

291. The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface. This statement pertaining to the solubility of gases in liquid is the ______________ law?
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A. Raoults

B. Amagats

C. None of these

D. Henrys
292. The density of a gas at N.T.P.is ?. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become 0.75 ? at a temperature of ____________ K?
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A. 373

B. 300

C. 400

D. 273

293. Heat of reaction is not influenced by__________________?
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A. The physical state (e.g., solid, liquid or gaseous) of reactants and products

B. None of these

C. The route/method through which final products are obtained

D. Whether the reaction is carried out at constant temperature or constant pressure

294. The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes. This is the _____________ law?
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A. Daltons

B. Avogadros

C. Amagats

D. Gay-Lussacs

295. Enthalpy of formation of NH3 is 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 ? N2 + 3H2, is equal to _____________ kJ/kg. mole?
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A. -23

B. 46

C. 92

D. -92

296. Percentage saturation of a vapor bearing gas is always _____________ the relative saturation?
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A. Equal to

B. Either A. or B.; depends on the system

C. Smaller than

D. Higher than

297. If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is _____________ times?
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A. 1000

B. 10000

C. 100

D. 10

298. Pick out the wrong statement?
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A. critical temperature is negligible</strong>

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

C. The value of Cp at critical temperature and pressure reaches infinity

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

E. The effect of pressure on heat capacity of gases at pressure above one atmosphere and above
299. The value of gas constant R is ______________ kcal/kg.mole.C?
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A. None of these

B. 1.987

C. 3.99

D. 2.79

300. Sodium ______________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature?
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A. Carbonate (monohydrate)

B. Thiosulphate

C. Bisulphite

D. Chloride