chemical engineering stoichiometry Mcqs
301. Which of the following is not a unit of kinematic viscosity ?
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A. None of these

B. Poise

C. Stoke

D. cm2/second

302. 1 Kcal/kg. C is equivalent to _______________ BTU/lb. F ?
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A. 4.97

B. None of these

C. 1

D. 2.42

303. In a binary liquid system, the composition expressed as _______________ is independent of the temperature & pressure?
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A. All A., B. & C.

B. Kg-mole of solute/kg-mole of solvent

C. Kg of solute/kg of solvent

D. Kg-mole of solute/1000 kg of solvent

304. If pH value of a solution is 8, then its pOH value will be ____________________?
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A. 10

B. 1

C. 7

D. 6
305. Hesss law of constant heat summation is based on conservation of mass. It deals with ___________________?
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A. Equilibrium constant

B. Reaction rate

C. None of these

D. Changes in heat of reaction
306. Solutions which distil without change in composition are called________________?
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A. Saturated

B. Supersaturated

C. Azeotropic

D. Ideal

307. On mixing 56 gm of CaO with 63 gm of HNO3, the amount of Ca(NO3)2 formed is ______________ gm?
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A. 8.2

B. 164

C. 82

D. 41

308. The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is_____________________?
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A. Termed as relative saturation

B. Not a function of the composition of gas mixture

C. Not a function of the nature of vapor

D. Called percentage saturation

309. Heat of transition is the heat evolved or absorbed, when a substance is converted from_________________?
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A. Vapor to solid

B. One allotropic form to another allotropic form

C. Vapor to liquid

D. Solid to liquid

310. At a temperature of 0K, the molecules of a gas have only _______________ energy?
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A. None of these

B. Translational

C. Vibrational

D. Rotational

311. In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the________________?
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A. Total pressure

B. Absolute humidity at a given temperature

C. Both A. and B.

D. Neither A. nor B.

312. In general, the specific heats of aqueous solutions _____________ with increase in the concentration of the solute?
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A. Increase

B. None of these

C. Remain unchanged

D. Decrease
313. As per Kirchhoff s equation, the heat of reaction is affected by the__________________?
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A. Temperature

B. Pressure

C. Molecularity

D. Volume

314. The vapour pressure of water is given by, in Psat = A (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50C is approximately__________________?
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A. 0.13

B. 0.09

C. 0.11

D. 0.07

315. Pick out the correct statement ?
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A. The heating of water in a beaker is an example of an isolated system

B. At equilibrium, ?G is zero

C. Heat of solution is always positive

D. For the reaction, PCl5 ? PCl3 + Cl2, ?G is less than ?E

316. pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________?
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A. 14

B. 10

C. 0

D. 7
317. Pick out the wrong unit conversion of mass transfer co-efficient?
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A. 1 lb/hr.ft2 = 4.8823 kg/hr.m2

B. 1 kg/hr.m2 = 4.8823 lb/hr.ft2

C. 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar

D. 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar

318. Pick out the wrong unit conversion ?
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A. 1 kgf= 9.8 Newton

B. 1 Pascal second = 10 poise

C. 1 ppm = 1 ml/m3 = 1 mg/kg

D. 1 stoke = 1 m2/second
319. A gaseous mixture contains 14 kg of N2, 16 kg of O2 and 17 kg of NH3. The mole fraction of oxygen is__________________?
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A. 0.66

B. 0.16

C. 0.47

D. 0.33
320. Atomic ______________ of an element is a whole number?
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A. Radius

B. Number

C. Weight

D. Volume

321. Heat of solution in a system in which both solute and solvent are liquids is termed as_________________?
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A. Heat of mixing

B. Standard integral heat of solution

C. Heat of hydration

D. Heat of solvation

322. If the partial pressure of the solvent in the vapor phase is equal to the vapor pressure of the solvent at that temperature, then the system is said to be at its___________________?
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A. Bubble point

B. Saturation temperature

C. Dew point

D. Both B. and C.
323. The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is_________________?
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A. 0.6

B. 0.4

C. 0.8

D. 0.2

324. S.T.P. corresponds to _________________?
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A. 760 torr & 0C

B. 1 atm. absolute pressure & 15.5C

C. 101.325 kPa gauge pressure & 15.5C

D. 760 mm Hg gauge pressure & 15.5C

325. Addition of a non-volatile solute to a pure solvent ____________________?
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A. Increases its freezing point

B. Increases its boiling point

C. Decreases its freezing point

D. Both B. and C.
326. Elements in a periodic table are arranged in order of their__________________?
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A. Metallic characteristics

B. Mass number

C. Atomic weight

D. Atomic number
327. The viscosity of water at room temperature may be around one ___________________?
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A. Centipoise

B. Poise

C. Stoke

D. Both B. & C.

328. Volume occupied by one gm mole of a gas at S.T.P. is ____________________?
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A. 359 litres

B. 22.4 c.c

C. 22.4 litres

D. 22400 litres

329. Unit of mass velocity is___________________?
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A. kg/m2.hr

B. kg/m.hr

C. kg/m2

D. kg/hr

330. Disappearance of snow in subzero weather exemplifies the process of_________________?
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A. Melting

B. Vaporisation

C. Evaporation

D. Sublimation
331. The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is ____________________?
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A. 16.5

B. 16

C. 17

D. 15.5

332. In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest ?
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A. 20 c.c acid and 25 c.c base

B. 30 c.c acid and 30 c.c base

C. 15 c.c acid and 35 c.c base

D. 35 c.c acid and 15 c.c base

333. In a neutral solution _________________?
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A. H+ ions are absent

B. OH- ions are absent

C. Both H+ and OH- ions are present in very small but equal concentration

D. None of these

334. The value of (Cp Cv) for a real gas obeying Vander Walls equation is____________________?
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A. R

B. > R

C. < R

D. 0.5 R

335. A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container___________________?
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A. Cannot be determined

B. Will be 298 K

C. Will be greater than 298 K

D. Will be less than 298 K
336. 1 torr is equivalent to_________________?
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A. 1 atm

B. 1 Pascal

C. 1 mm Hg

D. 1 mm wc

337. A limiting reactant is the one, which decides the ____________ in the chemical reaction?
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A. Conversion

B. Equilibrium constant

C. Rate constant

D. None of these

338. Heat of neutralisation of HCl and NaOH is 57.46 kJ/Kg mole. The heat of ionisation of water will be _____________ kJ/Kg mole?
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A. -57.46

B. 57.46

C. -28.73

D. 114.92

339. The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?
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A. Is not dependent on the temperature

B. Measures the depression in freezing point

C. Measures the elevation in boiling point

D. Is a function of the liquid phase composition
340. Pick out the wrong statement?
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A. The average value of heat of neutralisation of dilute solutions of weak acids and bases is much

B. ure & amount of the solute & the solvent, on the temperature & on the initial & final

C. The integral heat of solution of either component cannot be calculated from heat of mixing

D. a</strong>

E. centrations of the solution

F. solution of the anhydrous substance and its heat of hydration

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