Chemistry Unit 3 Test

Which of the following solid has highest lattice energy

• NaCl

• MgCl2

• AlCl₃

• CsCl

As the speed of gas molecules decreases, the number of collosions per second

• Increases

• Decreases

• Does not change

• Remains constant

The significant intermolecular force of attraction between neon and water is

• Dipole – dipole force

• Hydrogen bonding

• Debye force

• London dispersion force

If 20 g of a gas at 1 atmosphere pressure is cooled from 273°C to 0°C at constant pressure its volume would become

• Triple

• Double

• Half

• Constant

The postulate of kinetic theory of gases for ideal gas is

• Atom is indivisible

• Gases combine in a simple ratio

• The influence of gravity on the gaseous molecule is negligible

• The molecules have higher average speeds and strike the walls more often

The molecules of which gas have largest average K.E. at 250°C

• Argon

• Helium

• Carbon monoxide

• All have same average K.E.

The boiling point of water is maximum when external pressure is

• 1489 torr

• 23.7 torr

• 700 torr

• 323 torr

The vapour pressure of the liquid depends upon

• The amount of liquid taken

• The volume of the vessel

• The temperature of the liquid

• Both amount and temperature

The crystal of sugar has hydrogen bonding as well as covalent bonds so it belongs to

• Covalent solid

• Metallic solid

• Ionic solid

• Molecular solid

• Real gases

• Ideal gases

• Actual gases

• Both “a” and “b”