10-9 cm/sec
10-1 cm²/sec
10-3 sec/cm
10-4 cm²/seC₂
✅ The correct answer is option B.
Chemical Engineering MCQs
In extractive distillation, solvent is
Added to alter the relative volatility of the mixture
Of high volatility
Present in overhead stream
Of high viscosity to give high tray efficiency
✅ The correct answer is option A.
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to that of component ‘B’, when
Only vapor phase follows Raoult’s law
Only liquid phase obeys Dalton’s law
Liquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law
Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law
✅ The correct answer is option D.
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.
0.25
2.5
1.25
0.0025
✅ The correct answer is option A.
For the same system, if the same liquid used in an absorber is decreased, the tower height will
Increase
Decrease
Remain unaffected
Decrease or increase ; depends on the type of liquid
✅ The correct answer is option A.
Separation of two or more components of a liquid solution can not be achieved by
Fractional crystallisation
Liquid extraction
Absorption
Evaporation
✅ The correct answer is option C.
Separation of two volatile liquids by distillation makes use of their
Selectivity
Relative volatility
Solubility
Density difference
✅ The correct answer is option B.
Steam distillation is used for separation of high boiling
Substances from non-volatile impurities
Volatile impurity from still higher boiling substances
Both A & B
Neither A nor B
✅ The correct answer is option C.
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?
90
91.5
95
99
✅ The correct answer is option C.
Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.
Rotary
Vacuum
Tunnel
Tray
✅ The correct answer is option A.