IMAT - International Medical Admissions Chemical Bonding and Reactions Questions and Answers

Question 1

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

NH₄Cl

Answer

NaCl

Answer

CH₄

Answer

H₂O

Question 2

Based on the principles of intermolecular forces, which of the following substances is expected to have the highest boiling point?

Accepted Answer

H₂O (Water)

Answer

NH₃ (Ammonia)

Answer

CH₄ (Methane)

Answer

HF (Hydrogen Fluoride)

Question 3

In the single displacement reaction: Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s), which species acts as the oxidizing agent?

Accepted Answer

CuSO₄(aq)

Answer

Zn(s)

Answer

Cu(s)

Answer

Zn²⁺(aq)

Question 4

Consider the reversible reaction for the Haber process: N₂(g) + 3H₂(g) ⇌ 2NH₃(g), which is an exothermic reaction. According to Le Chatelier's principle, which of the following changes will shift the equilibrium to the right, favoring the production of ammonia?

Accepted Answer

Increasing the pressure

Answer

Increasing the temperature

Answer

Adding a catalyst

Answer

Decreasing the pressure

Question 5

According to the Brønsted-Lowry theory of acids and bases, a base is defined as a substance that:

Accepted Answer

accepts a proton (H⁺)

Answer

donates a proton (H⁺)

Answer

produces hydroxide ions (OH⁻) in water

Answer

accepts an electron pair

Question 6

A student is observing the reaction between a solid piece of marble (calcium carbonate, CaCO₃) and hydrochloric acid (HCl). Which of the following actions would most likely DECREASE the rate of the reaction?

Accepted Answer

Cooling the reaction mixture in an ice bath

Answer

Using a more concentrated solution of HCl

Answer

Grinding the marble into a fine powder

Answer

Gently stirring the mixture