chemical engineering Mcqs
8551. Atmospheric pressure corresponds to a hydrostatic head of_________________?
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A. 1 metre of H2O

B. 34 ft ofH2O

C. 13.6 cms of Hg

D. 13.6 metres of Hg

8552. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_______?
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A. Coke Oven Gas

B. Pulverised coke

C. Sulphide Coke

D. Tar

8553. Pick out the correct statement ?
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A. Heat, work, enthalpy and entropy are all state functions

B. Matter and energy cannot be exchanged with the surroundings in a closed system

C. In an isothermal system, irreversible work is more than reversible work

D. Under reversible conditions, the adiabatic work is less than isothermal work
8554. A sugar solution containing _________________ percent sugar is equivalent to 1 Brix?
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A. 0.01

B. 1

C. 0.1

D. 10

8555. A gas at 0C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________________?
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A. -136.5K

B. -136.5C

C. 0K

D. 0C

8556. pH value of a solution containing 1 gm of hydrogen ion per litre will be ____________________?
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A. 0

B. 10

C. 7

D. 1

8557. 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. -92

B. -23

C. 92

D. 46

8558. 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.
8559. Pick out the wrong statement?
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A. The net change in entropy in any reversible cycle is always zero

B. The entropy of the system as a whole in an irreversible process increases

C. The entropy of the universe tends to a maximum

D. The entropy of a substance does not remain constant during a reversible adiabatic change
8560. Disappearance of snow in subzero weather exemplifies the process of_________________?
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A. Evaporation

B. Vaporisation

C. Sublimation

D. Melting

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

8581. Clausius Clapeyron equation applies to the _____________ process?
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A. All A., B. & C.

B. Sublimation

C. Melting

D. Vaporisation

8582. Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is_________________?
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A. 0.58

B. 0.2

C. 1.72

D. 0.5

8583. 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

8584. Volume occupied by one gm mole of a gas at S.T.P. is ____________________?
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A. 22.4 c.c

B. 359 litres

C. 22.4 litres

D. 22400 litres

8585. Pick out the correct statement?
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A. An ideal gas on expansion in vacuum gets heated up

B. A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

C. A real gas on expansion in vacuum gets heated up

D. An ideal gas on expansion in vacuum gets cooled

8586. Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________?
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A. Do work equal to loss in kinetic energy

B. Do not lose energy on collision

C. Do not exert attractive force on each other

D. Are above the inversion temperature

8587. 80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is_________________?
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A. 0

B. 0.24

C. 0.18

D. 1

8588. Unit of mass velocity is___________________?
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A. kg/m.hr

B. kg/m2.hr

C. kg/hr

D. kg/m2

8589. 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. AB3

B. A2B

C. A2B3

D. AB2

8590. 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. M/2

B. 2M

C. M/4

D. M

8591. 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. 10

B. 100

C. 10000

D. 1000
8592. Baffles are provided in heat exchangers to____________?
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A. Remove dirt

B. Reduce heat transfer rate

C. Increase heat transfer rate

D. Reduce vibrations

8593. 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. 0.07

B. 0.09

C. 0.13

D. 0.11

8594. At a temperature of 0K, the molecules of a gas have only _______________ energy?
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A. Translational

B. Vibrational

C. None of these

D. Rotational

8595. Pick out the wrong statement ?
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A. The expansion of a gas in vacuum is an irreversible process

B. Entropy change for a reversible adiabatic process is zero

C. An isometric process is a constant pressure process

D. Free energy change for a spontaneous process is negative

8596. Giga stands for__________________?
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A. 1012

B. 1015

C. 12-Oct

D. 109
8597. Pick out the wrong statement?
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A. System (of partially miscible liquid pairs), in which the mutual solubility increases with rise

B. temperature, are said to possess an upper consolute temperature

C. Systems, in which the mutual solubility increases with decrease in temperature, are said to

D. sess lower consolute temperature

E. Nicotine-water system shows both an upper as well as a lower consolute temperature,

F. lying that they are partially miscible between these two limiting temperatures

8598. N.T.P. corresponds to__________________?
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A. 760 mm Hg gauge pressure & 0C

B. 1 atm absolute pressure & 0C

C. 101.325 KPa gauge pressure & 0C

D. 760 torr & 15C

8599. 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. St

B. 1/St

C. Sv

D. 1/Sv

8600. 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. 880

C. 760

D. 630