The quantity of heat required to convert one mole of liquid into its vapours at its boiling point is called molar heat of__________________?
A. vaporization
B. evaporation
C. crystallization
D. sublimation
Submitted by :- Jamil Ahmed
Forces of attraction which may be present between all kinds of atoms and molecules are _____________________?
A. intramolecular
B. intermolecular
C. van der Waal
D. Dipole-induced dipole
Submitted by :- Jamil Ahmed
Hydrogen bonding is involved in____________________?
A. Solubility
B. Cleansing action of detergents
C. Biological molecules
D. All
Submitted by :- Jamil Ahmed
Liquid crystal is discovered by __________________?
A. William Crooks
B. Fredrack Reinitzer
C. J.J Thomson
D. Bravis
Submitted by :- Jamil Ahmed
Vapour pressure of water at 100°C is___________________?
A. 550 mm Hg
B. 760 mm Hg
C. 355 mm Hg
D. 1489 mm Hg
Submitted by :- Jamil Ahmed
When substance moves from a solid to a liquid state all of the following changes occur except__________________?
A. Molecules become more disordered
B. K.E of the molecules decreases
C. Intermolecular forces become weaker
D. Molecule become further separated
Submitted by :- Jamil Ahmed
Which of the following has strongest intermolecular forces of attraction ?
A. Hydrogen (H2)
B. Chlorine (Cl2)
C. lodine (I2)
D. Methane (CH4)
Submitted by :- Jamil Ahmed
________________ is study about energy of a chemical system ?
A. thermochemistry
B. thermodynamics
C. chemical kinetics
D. stoichiometry
Submitted by :- Jamil Ahmed
Boiling points of hydrocarbons increase with the increase in number of carbon atoms. It is mainly due to_________________?
A. More strength of H-bonding
B. More strength of London forces
C. Less polarizability
D. All of the above
Submitted by :- Jamil Ahmed
Amorphous substances posses_________________?
A. No definite geometry
B. No definite heat of fusion
C. No sharp melting points
D. All of the above
Submitted by :- Jamil Ahmed