101. The latent heat of vaporisation
Decreases with increased temperature
Decreases as pressure increases
Becomes zero at the critical point
All of the above
✅ The correct answer is option D.
Statiometery MCQs
102. 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
180
60.3
720
200
✅ The correct answer is option B.
103. An oxidation process is accompanied by decrease in the
Number of electrons
Oxidation number
Number of ions
All of the above
✅ The correct answer is option A.
104. Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg.
80.38
80
79.62
78.51
✅ The correct answer is option C.
105. Number of gm moles of solute dissolved in one litre of a solution is called its
Equivalent weight
Molarity
Molality
Normality
✅ The correct answer is option B.
106. Dry air is a mixture of
Vapors
Gases
Both A & B
Neither A nor B
✅ The correct answer is option B.
107. In physical adsorption, as compared to chemisorption, the
Quantity adsorbed per unit mass is higher
Rate of adsorption is controlled by the resistance to surface reaction
Activation energy is very high
Heat of adsorption is very large
✅ The correct answer is option A.
108. The crystallisation of a solute from a solution may be done by
Removal of pure solvent by evaporation
Change of temperature thereby causing supersaturation
Changing the nature of the system by the addition of a more soluble material
All of the above
✅ The correct answer is option D.
109. Solutions which distil without change in composition are called
Ideal
Saturated
Supersaturated
Azeotropic
✅ The correct answer is option D.
110. How much O₂ can be obtained from 90 kg of water?
32 kg
80 kg
64 kg
90 kg
✅ The correct answer is option B.