chemical engineering MCQs – Page 429

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
8561. 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. 28.6

B. 32.6

C. 30.6

D. 30

8562. Pick out the correct statement?
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A. Noise from vibrating chutes can be reduced by lining the metallic chute with rubber

B. Noise from ball mills can be dealt with by fibre glass lined enclosures

C. Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and

D. ber/plastic covered metallic rollers

E. All A., B. & C.
8563. Pick out the wrong statement ?
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A. The chemical potential of species i in the mixture (?i) is mathematically represented as,?i =

B. The chemical potential of a component in a system is directly proportional to the escaping

C. (nG)/?ni]T,P,nj where, n, ni and nj respectively denote the total number of moles, moles of ith

D. cies and all mole numbers except ith species. G is Gibbs molar free energy

E. The chemical potential of ith species (?i) in an ideal gas mixture approaches zero as the

F. ssure or mole fraction (xi) tends to be zero at constant temperature</strong>

8564. The total number of atoms in 8.5 gm of NH3 is _______________ 1023?
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A. 3.01

B. 1.204

C. 6.02

D. 9.03
8565. Size range of the colloids particles is __________________?
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A. 10 50 Angstrom

B. 5 200 milli-microns

C. 50 200 microns

D. 500 1000 microns

8566. The heat capacity of a substance is ____________________?
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A. Greater for liquid state than for solid state

B. Equal for solid and liquid states below melting point

C. Higher for solid state than for liquid state

D. Lower for liquid state than for gaseous state

8567. Pick out the wrong statement ?
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A. In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the

B. The fugacity co-efficient is zero for an ideal gas

C. ponent.

D. Activity co-efficient is dimensionless.

E. In case of an ideal gas, the fugacity is equal to its pressure.

8568. Increasing the temperature of an aqueous solution will cause decrease in its________________?
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A. Mole fraction

B. Weight percent

C. Molality

D. Molarity
8569. Molar heat capacity of water in equilibrium with ice at constant pressure is_____________________?
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A. None of these

B. ?

C. 0

D. 1

8570. Gases diffuse faster compared to liquids because of the reason that the liquid molecules_________________?
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A. Are heavier

B. Move faster

C. Are held together by stronger inter-molecular forces

D. Have no definite shape

8571. Pick out the wrong statement ?
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A. ponsible for causing Minamata disease

B. Low ozone layer thickness in polar regions is due to cold climatic conditions

C. Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is

D. Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to

E. t emitted from a four stroke engine</strong>

F. t emitted by a four stroke engine

8572. Which of the following is not a colligative property ?
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A. Osmotic pressure

B. Depression of freezing point

C. None of these

D. Lowering of vapor pressure

8573. 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. 375

B. 650

C. 700

D. 600

8574. 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. Henrys

C. None of these

D. Amagats

8575. The heat capacity of most substances is greater for the _______________ state?
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A. Gaseous

B. Solid

C. None of these

D. Liquid
8576. DLS stands For_______?
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A. Drill line system

B. All of Above

C. Drill line stream

D. Dogleg severity
8577. If a solution of eutectic composition is cooled, _______________ reaching the eutectic temperature ?
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A. It will not solidify even on

B. It will undergo no change until

C. The solvent begins to freeze out even before

D. None of these

8578. 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

8579. The chemical nature of an element is independent of_______________________?
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A. Its atomic number

B. None of these

C. The number of protons or electrons present in it

D. The number of neutrons present in it
8580. 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. Sodium chloride

B. Hypo

C. Anhydrous sodium sulphate

D. Sodium carbonate monohydrate