Stoichiometry
For an ideal gas, the compressibility factor

Is unity at Boyle's temperature
Zero
Is unity at all temperature
Decreases with pressure rise

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Stoichiometry
The heat capacity of a substance is

Equal for solid and liquid states below melting point
Lower for liquid state than for gaseous state
Greater for liquid state than for solid state
Higher for solid state than for liquid state

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Stoichiometry
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.

No component is concentrated at the surface of the solution
The component molecules are non polar and are of almost equal size
In the formation of solution, chemical combination/molecular association between unlike molecules takes place
The attractive forces between like and unlike molecules are almost equal

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