Physical Chemistry

The nature of bonding between Al and chlorine in AlCl3 is

• Electrovalent

• Covalent

• Covalent with polar character

• Coordinate covalent

Rain drops are spherical in shape because of

• Surface tension

• Capillary

• Downward motion

• Acceleration due to gravity

The Phase rule is applicable to ____________

• Homogenous system

• Reversible system

• Irreversible system

• Heterogeneous system whether physical or chemical

When the angle of contact between a solid and a liquid is 90°, then

• Cohesive force > Adhesive force

• Cohesive force < Adhesive force

• Cohesive force = Adhesive force

• Cohesive force >> Adhesive force

Which of the following statements is incorrect?

• Hydrogen can give an electropositive ion by losing its electrons

• Hydrogen can form an electronegative ion by gaining another electron

• Hydrogen can combine with some other elements by means of covalency

• Hydrogen can enter into a coordinate linkage with other atoms

The SO4 consists of a central sulphur atom with four equivalent oxygen atoms. What should be the internal O-S-O bond angle be

• 6°

• 9°

• 109.5°

• 117

Ammonia has a net dipole moment while boron trifluoride has zero dipole moment because

• Fluorides is more electronegative

• Fluorides is more electronegative

• Boron trifluoride is pyramidal in shape while NH3 is planar

• NH3 is pyramidal in shape while BF3 is planar

Choose the wrong statement from the following.

• Small droplets of a liquid are spherical due to surface tension

• Oil rises through the wick due to capillarity

• In drinking the cold drinks through a straw, we use the phenomenon of capillarity

• Gum is used to stick two surfaces. In this process we use the property of adhesion

When there are no external forces, the shape of a liquid drop is determined by

• Surface tension of the liquid

• Density of liquid

• Viscosity of liquid

• Temperature of air only

A dilatometer is an apparatus used to measure

• Transition temperature

• Triple point

• Eutectic point

• All of these