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.Management Sciences
Category: Liquids and Solids
In order to mention the boiling point of water at 110°C the external pressure should be ?
A. Between 760 torr and 1200 torr
B. Between 200 torr and 760 torr
C. 765 torr
D. any value of pressure
Amorphous substances posses_________________?
A. No definite geometry
B. No definite heat of fusion
C. No sharp melting points
D. All of the above
Molar heat of vaporization of water is_________________?
A. 40.7 KJ/mole
B. 40.7 J/mole
C. 40.7 cal/mole
D. 40.7 Kcal/mole
Which solids are called true solids _______________?
A. Metallic
B. Amorphous
C. Crystalline
D. Vitreous
Which of the following has strongest intermolecular forces of attraction ?
A. Hydrogen (H2)
B. Chlorine (Cl2)
C. lodine (I2)
D. Methane (CH4)
Isomorphic substances have _______________?
A. Same physical and chemical properties
B. Same physical and different chemical properties
C. Different physical and same chemical properties
D. Different physical and chemical properties
When water freezes at 0°C its density decreases due to_______________?
A. Change of bond angles
B. Cubic structure of ice
C. Empty space present in the structure of ice
D. Change of bond length
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
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