مائعات

گیارہویں جماعت · کیمیا · 5 سوالات

نام: ____________________ تاریخ: ____________

Boiling point of a liquid is the temperature at which its vapour pressure equals the:
- A Osmotic pressure
- B Atmospheric pressure
- C Zero
- D Critical pressure
Hydrogen bonding is strongest in:
- A HCl
- B H2S
- C CH4
- D H2O
Surface tension tends to:
- A Minimise the surface area
- B Increase the surface area
- C Increase temperature
- D Remove cohesion
The viscosity of a liquid decreases when it is:
- A Heated
- B Compressed
- C Cooled
- D Frozen
London dispersion forces are present in:
- A All molecules
- B Only polar molecules
- C Only ions
- D Only metals

جوابی کلید

1. B, 2. D, 3. A, 4. A, 5. A

A liquid boils when its vapour pressure equals the external pressure.
Water has O-H bonds that form strong hydrogen bonds.
It pulls a liquid surface to the smallest area, giving droplets their round shape.
Heating weakens attractions between molecules.
Dispersion forces exist between all molecules and atoms.