MDCAT 2026 MCQs

The balanced equation fixes the required mole ratio.
Comparison of available amounts shows that N₂ is consumed first.

The balanced equation fixes the required mole ratio.
Comparison of available amounts shows that O₂ is consumed first.

The coefficients of CaCO₃ and CO₂ are both one.
Two moles of CaCO₃ therefore form two moles of CO₂.

The balanced equation fixes the required mole ratio.
Comparison of available amounts shows that Na is consumed first.

Percentage yield = actual yield ÷ theoretical yield × 100.
(8 ÷ 10) × 100 = 80%.

Percentage yield = actual yield ÷ theoretical yield × 100.
(36 ÷ 40) × 100 = 90%.

Percentage yield = actual yield ÷ theoretical yield × 100.
(72 ÷ 80) × 100 = 90%.

Percentage yield = actual yield ÷ theoretical yield × 100.
(15 ÷ 20) × 100 = 75%.

Condensation polymerization joins bifunctional monomers.
Water or another small molecule is often released.

Number of particles = moles × Avogadro constant.
2 × 6.02×10²³ = 1.2e+24.

The molecule has two carbons and an alcohol group.
The correct name is ethanol.

Number of particles = moles × Avogadro constant.
3 × 6.02×10²³ = 1.81e+24.