40 TOP Stoichiometry Online Test – Multiple Choice Questions and Answers 1. What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100°C, if their vapor pressures at 100°C are 1340, 560 and 210 mmHg respectively ? 756.2 780.5 801.5 880.5 2. In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is unchanged by the pressure change increased with the increase in pressure decreased with the increase in pressure independent of the temperature 3. The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the experimental data emperical equations phase rule theoretical equations 4. Pick out the wrong statement: A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a ‘superheated vapor’ The temperature at which a vapor is saturated is termed as the boiling point A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure The difference between the existing temperature of a vapor and its saturation temperature (i.e. dew point) is called its ‘degree of superheat’ 5. 2 litres of nitrogen at N.T.P. weighs __________ gms 1.25 2.5 14 28 6. If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will increase four times be reduced to l/4th increase two times none of these 7. In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality? Activity co-efficient Fugacity co-efficient Use of equation of state None of these 8. Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the recycling purging bypassing recirculation 9. A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor supersaturated saturated superheated none of these 10. An azeotropic solution of two liquids has boiling point lower than either of them, when it is saturated is unsaturated shows positive deviation from Raoult’s law shows negative deviation from Raoult’s law Loading … Question 1 of 10
