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TOPIC:
Gases, Liquids & Solids
QUESTION:
If dipole-dipole forces of X are stronger than Y. then which of the following is not true?
OPTIONS:
- 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
CORRECT OPTION:
Y has greater heat of sublimation than X
EXPLANATION:
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.
TOPIC:
Thermodynamics
QUESTION:
Which of the following is not a state function?
OPTIONS:
- Volume
- Temperature
- Work
- Enthalpy
CORRECT OPTION:
Work
EXPLANATION:
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.
TOPIC:
Reaction Kinetics
QUESTION:
For third order reactions the half-life is?
OPTIONS:
- 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
CORRECT OPTION:
Inversely proportional to the square of the initial concentration of the reactants
EXPLANATION:
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