MDCAT 2026 MCQs

Evaporation can occur below the boiling point.
Higher-energy surface molecules escape preferentially.

The first bond between two atoms is sigma.
The second bond is pi.

Cohesive forces pull surface molecules inward.
Stronger intermolecular forces generally increase surface tension.

A triple bond contains one axial sigma bond.
Two perpendicular pi bonds complete the bond order of three.

Viscosity arises from internal friction.
It usually decreases for liquids as temperature increases.

Hydrogen bonding is stronger than ordinary dipole forces.
It strongly affects boiling point and solubility.

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

Dispersion forces occur in all atoms and molecules.
Their strength generally increases with polarizability.

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

Polar molecules align partially positive and negative regions.
These attractions affect physical properties.

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

Hydrogen bonds require significant energy to overcome.
This raises water's boiling point relative to similar-size molecules.