181. The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies
XM < 0.5
XM = 0.5
0.5 < XM < 0.64
XM ≥ 0.64
✅ The correct answer is option D.
Statiometery MCQs
182. If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature.
The solvent begins to freeze out even before
It will undergo no change until
It will not solidify even on
None of these
✅ The correct answer is option B.
183. Size range of the colloidals particles is
5 – 200 milli-microns
50 – 200 microns
500 – 1000 microns
10 – 50 Angstrom
✅ The correct answer is option A.
184. A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is
13728 J
19206 J
4576 J
12712 J
✅ The correct answer is option B.
185. 1 bar is almost equal to __________ atmosphere.
1
10
100
1000
✅ The correct answer is option A.
186. The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is
Termed as relative saturation
Not a function of the composition of gas mixture
Called percentage saturation
Not a function of the nature of vapor
✅ The correct answer is option A.
187. Molar heat capacity of water in equilibrium with ice at constant pressure is
0
∞
1
None of these
✅ The correct answer is option B.
188. Isotonic solutions must have the same
Viscosity
Molar concentration
Normality
Critical temperature
✅ The correct answer is option B.
189. Heat of neutralisation of HCl and NaOH is – 57.46 kJ/Kg mole. The heat of ionisation of water will be __________ kJ/Kg mole.
57.46
-57.46
114.92
-28.73
✅ The correct answer is option A.