241. Average molecular weight of air is about ____________________?
A. 21
B. 29
C. 23
D. 79

242. If pH value of a solution is 8, then its pOH value will be ____________________?
A. 6
B. 1
C. 7
D. 10

243. 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 ____________________?
A. 15.5
B. 16
C. 16.5
D. 17

244. S.T.P. corresponds to _________________?
A. 1 atm. absolute pressure & 15.5°C
B. 760 mm Hg gauge pressure & 15.5°C
C. 760 torr & 0°C
D. 101.325 kPa gauge pressure & 15.5°C

245. In general, the specific heats of aqueous solutions _____________ with increase in the concentration of the solute?
A. Increase
B. Decrease
C. Remain unchanged
D. None of these

246. The chemical nature of an element is independent of_______________________?
A. Its atomic number
B. The number of protons or electrons present in it
C. The number of neutrons present in it
D. None of these

247. For most salts, the solubility increases with rise in temperature, but the solubility of _______________ is nearly independent of temperature rise?
A. Sodium chloride
B. Sodium carbonate monohydrate
C. Anhydrous sodium sulphate
D. Hypo

248. At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?
A. 6
B. 8
C. 10
D. 12

249. The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is_____________________?
A. Termed as relative saturation
B. Not a function of the composition of gas mixture
C. Called percentage saturation
D. Not a function of the nature of vapor

250. Molar heat capacity of water in equilibrium with ice at constant pressure is_____________________?
A. 0
B. ∞
C. 1
D. None of these

NOTE
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