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_________________?
(A) 1.72
(B) 0.58
(C) 0.5
(D) 0.2
Elements in a periodic table are arranged in order of their__________________?
(A) Atomic number
(B) Mass number
(C) Atomic weight
(D) Metallic characteristics
The most convenient way of expressing solution concentration is in terms of___________________?
(A) Mole fraction
(B) Normality
(C) Molality
(D) Molarity
Disappearance of snow in subzero weather exemplifies the process of_________________?
(A) Evaporation
(B) Sublimation
(C) Vaporisation
(D) Melting
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 50°C is approximately__________________?
(A) 0.07
(B) 0.09
(C) 0.11
(D) 0.13
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__________________?
(A) 180
(B) 60.3
(C) 720
(D) 200
Volume occupied by one gm mole of a gas at S.T.P. is ____________________?
(A) 22.4 litres
(B) 22400 litres
(C) 22.4 c.c
(D) 359 litres
Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ?
(A) Temperature
(B) Nature of solute
(C) Pressure
(D) Nature of solvent
According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?
(A) T
(B) T0.5
(C) T1.5
(D) T2