🏭Chemical Engineering MCQs
Chemical Engineering MCQs
496 MCQs421
The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?
AMeasures the elevation in boiling point
BIs not dependent on the temperature
CIs a function of the liquid phase composition
DMeasures the depression in freezing point
422
Size range of the colloids particles is __________________?
A5 – 200 milli-microns
B50 – 200 microns
C500 – 1000 microns
D10 – 50 Angstrom
423
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 500°C to – 100°C is ____________________?
A10.73 kJ
B16.15 kJ
C18.11 kJ
D18.33 kJ
424
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_________________?
A0.00
B0.18
C0.24
D1.00
425
S.T.P. corresponds to _________________?
A1 atm. absolute pressure & 15.5°C
B760 mm Hg gauge pressure & 15.5°C
C760 torr & 0°C
D101.325 kPa gauge pressure & 15.5°C
426
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 ____________________?
A15.5
B16
C16.5
D17
427
If pH value of a solution is 8, then its pOH value will be ____________________?
A6
B1
C7
D10
428
Average molecular weight of air is about ____________________?
A21
B29
C23
D79
429
What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C ?
A2/3
B1/3
C1/2
D1/3 × (298/273)
430
An ideal gas can be liquefied, because ___________________?
AIts molecular size is very small
BIts critical temperature is more than 0°C
CForces operative between its molecules are negligible
DIt gets solidified directly without becoming liquid