chemical engineering Mcqs
8651. 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. 15.5

D. 17

8652. Normality of a solution does not change with the increase in the __________________?
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A. Pressure

B. Temperature

C. Solute concentration

D. Dilution of the solution

8653. 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. Trebled

B. Unpredictable

C. Halved

D. Doubled

8654. Number of gm moles of solute dissolved in one liter of a solution is called its____________________?
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A. Equivalent weight

B. Molarity

C. Normality

D. Molality

8655. Average molecular weight of air is about ____________________?
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A. 29

B. 79

C. 23

D. 21

8656. As per Kirchhoff s equation, the heat of reaction is affected by the__________________?
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A. Molecularity

B. Volume

C. Temperature

D. Pressure

8657. 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. 3-Feb

B. 1/3

C. 2-Jan

D. 1/3 (298/273)

8658. _________________ chart is a graph related to Antoine equation ?
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A. Enthalpy-concentration

B. Molliers

C. Cox

D. Ostwald

8659. Which of the following is not a unit of kinematic viscosity ?
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A. Stoke

B. cm2/second

C. Poise

D. None of these

8660. An ideal gas can be liquefied, because ___________________?
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A. Its molecular size is very small

B. Its critical temperature is more than 0C

C. Forces operative between its molecules are negligible

D. It gets solidified directly without becoming liquid

8661. Pick out the wrong conversion formula for the conversion of weight units ?
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A. None of these

B. 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton

C. 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons

D. 1 tonne = 1000 kg = 22.046 lbs

8662. If 1 Nm3 of O2 contains N number of molecules, then number of molecules in 2Nm3 of SO2 will be_________________?
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A. 2N

B. N/2

C. 4N

D. N

8663. RIH stands for ________?
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A. Run in hole

B. None of these

C. Rest in hole

D. Rip in hole

8664. Air at a temperature of 20C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20C is 17.5 mm Hg?
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A. 80.38

B. 79.62

C. 80

D. 78.51

8665. Pick out the wrong statement?
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A. Inhalation of pollutant carbon monoxide results in death by asphyxiation

B. Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles

C. osphere

D. aust emissions

E. Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in

F. Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in

8666. S.T.P. corresponds to _________________?
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A. 1 atm. absolute pressure & 15.5C

B. 760 mm Hg gauge pressure & 15.5C

C. 101.325 kPa gauge pressure & 15.5C

D. 760 torr & 0C

8667. Pick out the wrong statement?
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A. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven

B. omobile exhaust

C. NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light

D. Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees

E. H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is

F. dised to SO2</strong>

8668. 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. Will be greater than 298 K

B. Cannot be determined

C. Will be less than 298 K

D. Will be 298 K

8669. The value of gas constant R is ______________ kcal/kg.mole.C?
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A. None of these

B. 2.79

C. 1.987

D. 3.99

8670. Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?
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A. Boiling point depression

B. Vapor pressure lowering

C. All A., B. & C.

D. Freezing point elevation

8671. 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.

8672. The depression in freezing point of a solution is________________?
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A. Inversely proportional to the mass of solvent

B. Directly proportional to the mole of solute

C. Both A. and B.

D. Neither A. nor B.

8673. Pick out the wrong statement?
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A. ides the source & sink temperatures</strong>

B. #NAME?

C. During a reversible adiabatic process, the entropy of a substance remains constant

D. Heat transferred is equal to the change in the enthalpy of the system, for a constant pressure,

E. The values of (?P/?V)T and (?2P/?V2)T are zero for a real gas at its critical point

F. Thermal efficiency of a Carnot engine depends upon the properties of the working fluid
8674. 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. 2-Jan

B. 4-Jan

C. ?2

D. 4

8675. Pick out the extensive property out of the following ?
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A. Free energy

B. Specific heat

C. Surface tension

D. Refractive index

8676. Pick out the correct statement ?
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A. Lightening discharges are natural source of production of SO2 & H2S pollutant

B. lone</strong>

C. Sulphur dioxide causes death by asphyxiation

D. Global warming is detrimental for increase in food productivity and may cause flood and

E. Deforestation helps in controlling the green house effect

8677. 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. The attractive forces between like and unlike molecules are almost equal

B. In the formation of solution, chemical combination/molecular association between unlike

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

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

E. ecules takes place</strong>

8678. One Therm is equivalent to___________________?
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A. 105 BTU

B. 109 BTU

C. 109 kcal

D. 105 kcal

8679. Pick out the wrong statement?
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A. An equation relating pressure, volume and temperature of a gas is called ideal gas equation

B. Thermal efficiency of a Carnot engine is always less than 1

C. None of these

D. Troutons ratio of non-polar liquids is calculated using Kistyakowsky equation

8680. 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.

8681. 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

8682. In a binary liquid system, the composition expressed as _______________ is independent of the temperature & pressure?
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A. Kg-mole of solute/kg-mole of solvent

B. All A., B. & C.

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

D. Kg of solute/kg of solvent

8683. 1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?
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A. 20

B. 10

C. 15

D. 5

8684. 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. Percentage saturation

D. Relative saturation

8685. Pick out the correct statement ?
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A. For the reaction, PCl5 ? PCl3 + Cl2, ?G is less than ?E

B. The heating of water in a beaker is an example of an isolated system

C. At equilibrium, ?G is zero

D. Heat of solution is always positive

8686. pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________?
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A. 0

B. 10

C. 7

D. 14

8687. 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. 5

B. 1

C. 0.5

D. 3

8688. 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. Nature of the gas

B. Nature of the liquid

C. Total pressure

D. Temperature of the liquid

8689. 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. 0.2

B. 0.6

C. 0.8

D. 0.4

8690. A very dilute solution is prepared by dissolving x1 mole of solute in x2 mole of a solvent. The mole fraction of solute is approximately equal to_________________?
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A. 1 (x1/x2)

B. x1/x2

C. 1/x2

D. x2/x1

8691. 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. 720

B. 180

C. 200

D. 60.3
8692. 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. 35 c.c acid and 15 c.c base

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

C. 20 c.c acid and 25 c.c base

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

8693. 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. 18.33 kJ

B. 16.15 kJ

C. 10.73 kJ

D. 18.11 kJ
8694. Which of the following has the smallest least effect on the solubility of a solute into the solvent ?
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A. Nature of the solute

B. Nature of the solvent

C. Pressure

D. Temperature

8695. With increase in the solute concentration, the specific heat of aqueous solutions _____________________?
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A. Remains unchanged

B. Increases

C. Decreases

D. Either A. or B.; depends on the type of solution

8696. Pick out the correct statement?
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A. put of work

B. Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work

C. Efficiency of an Otto engine is higher than that of a diesel engine for the same compression

D. Diesel engine normally operates at lower compression ratio than an Otto engine for an equal

E. duced per quantity of heat

F. io</strong>

8697. According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?
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A. T0.5

B. T2

C. T

D. T1.5

8698. In a chemical process, the recycle stream is purged for______________________?
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A. Limiting the inerts

B. Increasing the product yield

C. Heat conservation

D. Enriching the product

8699. The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be______________?
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A. More acidic

B. Basic

C. Neutral

D. Of the same acidity

8700. Pick out the wrong statement?
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A. The value of Cp at critical temperature and pressure reaches infinity

B. The value of Cp of gases increases with increase in pressure, above atmospheric pressure

C. All A., B., and C.

D. critical temperature is negligible</strong>

E. The effect of pressure on heat capacity of gases at pressure above one atmosphere and above