Chemical Engineering Objective Questions { Stoichiometry }

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253. Raoult's law is not applicable to the

A. Solutes which dissociate or associate in the particular solution

B. Concentrated solutions

D. Solutions containing non-volatile solute

254. The elevation in boiling point of a solution is proportional to the __________ of the solution.

A. Molal concentration

B. Reciprocal of the molal concentration

255. For an ideal gas, the compressibility factor

A. Decreases with pressure rise

B. Is unity at all temperature

C. Is unity at Boyle's temperature

256. 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

257. Unit of power is

C. Joule/Second

258. Pick out the wrong statement:

A. A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure

B. A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a 'superheated vapor'

C. The temperature at which a vapor is saturated is termed as the boiling point

D. The difference between the existing temperature of a vapor and its saturation temperature (i.e. dew point) is called its 'degree of superheat'

259. If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will

A. Remain unaltered

B. Increase nine fold

C. Increase three fold

D. Decrease three fold

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