According to Raoult's law, "The vapor pressure exerted by component in a solutio

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Question
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.
Options
A. No component is concentrated at the surface of the solution.
B. The component molecules are non polar and are of almost equal size.
C. In the formation of solution, chemical combination/molecular association between unlike molecules takes place.
D. The attractive forces between like and unlike molecules are almost equal.

Correct Answer

In the formation of solution, chemical combination/molecular association between unlike molecules takes place.

6. The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
Options
A. 3/4th of it will disintegrate in two months.
B. it will completely disintegrate in two months.
C. it will completely disintegrate in four months.
D. l/8th of it will remain intact at the end of four months.

10. The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation
Options
A. increases with pressure rise.
B. decreases with increasing pressure.
C. becomes zero at the critical point.
D. both (b) & (c).

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