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Gases, Liquids & Solids
If dipole-dipole forces of X are stronger than Y. then which of the following is not true?
- X has higher melting point than Y
- X has higher boiling point than Y
- Y has lower heat of vaporization than X
- Y has greater heat of sublimation than X
Y has greater heat of sublimation than X
Greater the strength of dipole-dipole forces, greater the values of thermodynamic parameters like melting point, boiling point, heat of vaporization and heat of sublimation. Hence D is wrong.
Which of the following is not a state function?
In thermodynamics, a state function, function of state, state quantity or state variable is a property of a system that depends only on the current state of the system, not on the way in which the system acquired that state (independent of path). A state function describes the equilibrium state of a system. Work is not a property of a system, so it is not a state function.
For third order reactions the half-life is?
- Independent of the initial concentration of the reactants
- Inversely proportional to the initial concentration of the reactants
- Inversely proportional to the square of the initial concentration of the reactants
- Inversely proportional to the cube of the initial concentration of the reactant
Inversely proportional to the square of the initial concentration of the reactants
For third order reactions, the rate of the reaction is inversely proportional to the square of the initial concentration of the reactants.
[t1/2] = 1.5/ka2