Pakistan MCQs

Solubility depends on temperature and the nature of solute and solvent.
For gases, pressure also matters.

A saturated solution is in equilibrium with undissolved solute.
Additional solute will not dissolve under unchanged conditions.

More solute can dissolve in an unsaturated solution.
Its concentration is below the solubility limit.

Supersaturated solutions are metastable.
Crystallization can be triggered by a seed crystal or disturbance.

For a fixed gas sample at constant temperature, PV is constant.
Compression increases pressure.

Polar solvents favor polar or ionic solutes.
Nonpolar solvents favor nonpolar solutes.

Gas volume rises with kelvin temperature at fixed pressure.
Temperature must be on an absolute scale.

Colloidal particles remain dispersed for long periods.
They can scatter light through the Tyndall effect.

Heating a fixed-volume gas raises pressure.
The relationship uses absolute temperature.

True solutions generally do not show visible light scattering.
Colloids make a light beam visible.

Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.
More moles require more volume.

Use P1V1=P2V2.
V2=100×4.0/200 = 2.0 L.