chemical engineering stoichiometry MCQs – Page 20

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 Review each marked answer and report any item that may be outdated or unclear.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

381. With increase in the temperature of pure (distilled) water, its____________________?
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A. pOH decreases and pH increases

B. pOH and pH both decreases

C. pH and pOH both increases

D. pH decreases and pOH increases

382. The temperature at which a real gas obeys Boyles law is termed as the__________________?
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A. Inversion temperature

B. Triple point

C. Eutectic point

D. Boyles temperature

383. Raoults law is not applicable to the___________________?
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A. Solutes which dissociate or associate in the particular solution

B. Concentrated solutions

C. Both B. & C.

D. Solutions containing non-volatile solute

384. A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?
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A. 380

B. 630

C. 760

D. 880

385. The heat capacity of a substance is ____________________?
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A. Greater for liquid state than for solid state

B. Lower for liquid state than for gaseous state

C. Higher for solid state than for liquid state

D. Equal for solid and liquid states below melting point

386. Atoms of the same element, but of different masses are called__________________?
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A. None of these

B. Isotopes

C. Isotones

D. Isobars

387. 1 Pascal (unit of pressure) is equal to _______________ N/m2 ?
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A. 10

B. 1000

C. 0.1

D. 1

388. Cp is expressed in S.I. unit as_______________?
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A. J/kg.K

B. W/m.K

C. 0K

D. W/m2.C

389. Pick out the wrong statement?
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A. Heat capacity of a diatomic gas is higher than that of a monatomic gas

B. Equal volumes of Argon and Krypton contain equal number of atoms

C. Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023

D. The binary mixture of a particular composition in both vapor and liquid state is known as an azeotropic mixture

390. The quantity of heat required to evaporate 1 kg of a saturated liquid is called __________________?
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A. Latent heat

B. 1 Kcal

C. Specific heat

D. Sensible heat

391. 6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be ______________ gm?
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A. 0.5

B. 3

C. 5

D. 1

392. pH value of H2SO4 (5% concentration) is__________________?
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A. < 7

B. > 7

C. 7

D. 5

393. Na2SO4. 10H2O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na2SO4. The final concentration of the solute in the solution is 10%. The weight of crystals is________________?
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A. 32.2

B. 45.35

C. 20

D. 58.65

394. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500C to 100C is ____________________?
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A. 10.73 kJ

B. 18.33 kJ

C. 16.15 kJ

D. 18.11 kJ

395. In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is__________________?
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A. 200

B. 60.3

C. 720

D. 180

396. Total energy at a point comprises of _____________ energy?
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A. Pressure

B. Internal

C. Potential & kinetic

D. All A., B. & C.

397. Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?
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A. 1/log H+

B. log (1/H+)

C. None of these

D. log (1/H+)

398. 1 gm mole of methane (CH4) contains_________________?
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A. 3 gms of carbon

B. 4 gm atoms of hydrogen

C. 6.02 1023 atoms of hydrogen

D. 3.01 1023 molecules of methane

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