A-Level Chemistry Fundamentals

Question 1

What is the shape and bond angle of a methane (CH₄) molecule?

Accepted Answer

Tetrahedral, 109.5°

Answer

Trigonal planar, 120°

Answer

Linear, 180°

Answer

Pyramidal, 107°

Question 2

Which of the following best describes an ionic bond?

Accepted Answer

Electrostatic attraction between oppositely charged ions formed by electron transfer

Answer

A shared pair of electrons between two non-metal atoms

Answer

Delocalised electrons in a sea surrounding positive metal ions

Answer

A weak intermolecular force between polar molecules

Question 3

In a titration, 25.0 cm³ of 0.100 mol dm⁻³ NaOH is exactly neutralised by HCl. If 20.0 cm³ of HCl was used, what is its concentration?

Accepted Answer

0.125 mol dm⁻³

Answer

0.100 mol dm⁻³

Answer

0.0800 mol dm⁻³

Answer

0.200 mol dm⁻³

Question 4

What is the oxidation state of manganese in the permanganate ion MnO₄⁻?

Accepted Answer

+7

Answer

+4

Answer

+5

Answer

+6

Question 5

Which of the following molecules exhibits hydrogen bonding?

Accepted Answer

HF

Answer

CH₄

Answer

H₂S

Answer

PH₃

Question 6

What is the empirical formula of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

CH₂O

Answer

C₂H₄O₂

Answer

CHO

Answer

C₃H₆O₃