مائعات

Boiling point of a liquid is the temperature at which its vapour pressure equals the:

• 1 Osmotic pressure
• 2 Atmospheric pressure
• 3 Zero
• 4 Critical pressure

Hydrogen bonding is strongest in:

• 1 HCl
• 2 H2S
• 3 CH4
• 4 H2O

Surface tension tends to:

• 1 Minimise the surface area
• 2 Increase the surface area
• 3 Increase temperature
• 4 Remove cohesion

The viscosity of a liquid decreases when it is:

• 1 Heated
• 2 Compressed
• 3 Cooled
• 4 Frozen

London dispersion forces are present in:

• 1 All molecules
• 2 Only polar molecules
• 3 Only ions
• 4 Only metals

A liquid with weak intermolecular forces has a:

• 1 High surface tension
• 2 Low boiling point
• 3 High viscosity
• 4 High boiling point

Capillary action is due to:

• 1 Magnetism
• 2 Adhesion and cohesion
• 3 Gravity only
• 4 Heat

The process in which a liquid changes to vapour only at its surface is:

• 1 Condensation
• 2 Boiling
• 3 Sublimation
• 4 Evaporation