Statiometery MCQs

Raoult’s law states that ‘the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component’. This generalisation is based on the assumption that the

by
Sizes of the component molecules are approximately equal
Attractive forces between like and unlike molecules are approximately equal
Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution
All of the above
✅ The correct answer is option D.

The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the

by
Temperature & pressure
Number of intermediate chemical reactions involved
State of aggregation & the state of combination at the beginning & the end of the reaction
None of these
✅ The correct answer is option B.

Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are PvB and Pvw respectively. The partial pressure of benzene in air-vapour mixture is

by
PvB
XB.PvB
(Patm – Pvw)xB
XB.Patm
✅ The correct answer is option B.