Imperial University: Department of Chemistry

Imprerial University: Department of Chemistry



Course: General Chemistry I

Exam Title: Midterm Examination

Duration: 2 Hours

Instructions: Answer all questions. Use proper scientific notation, units, and
diagrams where necessary. Show all steps in calculations. Essay responses
should be coherent, well-structured, and concise.




Section A: Multiple Choice (1 mark each – 10 marks total)



1. Which of the following elements is a metalloid?

A) Oxygen

B) Silicon

C) Sodium

D) Sulfur



2. The atomic number of an element is equal to the number of:

A) Neutrons

B) Electrons plus protons

, C) Protons

D) Nucleons



3. Avogadro’s number is:

A) 6.022 × 10²³ atoms

B) 1.008 g/mol

C) 3.14 × 10⁸ m/s

D) 9.81 m/s²



4. Which of the following is not a property of an ideal gas?

A) No intermolecular forces

B) Zero volume of particles

C) Particles are in constant, random motion

D) Attractive forces increase with temperature



5. What is the molecular geometry of NH₃?

A) Linear

B) Tetrahedral

C) Trigonal planar

D) Trigonal pyramidal



6. Which law states that the pressure of a gas is inversely proportional to its
volume at constant temperature?

A) Charles's Law

B) Boyle’s Law

C) Avogadro’s Law

D) Dalton’s Law