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Liquids
5 Class 11 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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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
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Correct answer: Atmospheric pressure
A liquid boils when its vapour pressure equals the external pressure.
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Hydrogen bonding is strongest in:
- 1 HCl
- 2 H2S
- 3 CH4
- 4 H2O
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Correct answer: H2O
Water has O-H bonds that form strong hydrogen bonds.
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Surface tension tends to:
- 1 Minimise the surface area
- 2 Increase the surface area
- 3 Increase temperature
- 4 Remove cohesion
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Correct answer: Minimise the surface area
It pulls a liquid surface to the smallest area, giving droplets their round shape.
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The viscosity of a liquid decreases when it is:
- 1 Heated
- 2 Compressed
- 3 Cooled
- 4 Frozen
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London dispersion forces are present in:
- 1 All molecules
- 2 Only polar molecules
- 3 Only ions
- 4 Only metals
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Correct answer: All molecules
Dispersion forces exist between all molecules and atoms.