chemical engineering stoichiometry Mcqs
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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A. Concentration of solution

B. Nature of solvent

C. All A., B. & C.

D. Nature of solute

259. Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?
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A. Sv

B. 1/Sv

C. 1/St

D. St

260. According to Raoults law, The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component. Raoults law is not applicable under the following assumption/condition?
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A. In the formation of solution, chemical combination/molecular association between unlike

B. No component is concentrated at the surface of the solution

C. The component molecules are non polar and are of almost equal size

D. ecules takes place</strong>

E. The attractive forces between like and unlike molecules are almost equal

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
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