231. The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the_____________________?
A. Relative humidity
B. Relative saturation
C. Percentage saturation
D. None of these

232. Density of carbon dioxide is _________________ kg/Nm3 ?
A. 44/22400
B. 44/22.4
C. 22.4/44
D. None of these

233. No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules____________________?
A. Collide without loss of energy
B. Do work equal to loss in kinetic energy
C. Are above the inversion temperature
D. Exert no attractive force on each other

234. Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is___________________?
A. 1/9
B. 8/9
C. 1/2
D. 5/9

235. pH value of a solution containing 1 gm of hydrogen ion per litre will be ____________________?
A. 0
B. 1
C. 7
D. 10

236. A sugar solution containing _________________ percent sugar is equivalent to 1 Brix?
A. 0.01
B. 0.1
C. 1
D. 10

237. The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is_________________?
A. 0.4
B. 0.6
C. 0.8
D. 0.2

238. The heat capacity of most substances is greater for the _______________ state?
A. Solid
B. Liquid
C. Gaseous
D. None of these

239. Isotopes are atoms having the same _____________________?
A. Mass number
B. Number of neutrons
C. Atomic mass
D. None of these

240. Which of the following is not a unit of kinematic viscosity ?
A. Poise
B. Stoke
C. cm2/second
D. None of these

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