Listed as lowest demand.

Listed as lowest demand.

Relative atomic mass calculation was challenging for some; A (too low) was a popular incorrect answer.

Reason for conductivity recalled, but ionic vs metallic description confused; C commonly chosen.

Confusion between electrolysis of dilute vs concentrated halide solutions; many chose B.

Evidence of guessing noted.

Contact process conditions confused with Haber process; many chose B.

Most chose C, focusing on oxygen movement not electrons; no oxidation number change in C so not redox.

Properties of strong acids proved challenging; many appeared to be guessing.

B most common; poorer performers likely to choose distractors.

Over half chose B; that equation represents reduction of Fe³⁺ to iron(III) oxide. Preventing rusting requires a change before oxide forms.

Structural isomerism not well recalled; D commonly chosen.

Less well-performing candidates appeared to be guessing; options nearly equally chosen.

Most recalled pipette and burette are most precise in titration; some confused them and chose D.