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2017 O Level Chem P1 Q24 — Periodic Table / Transition Elements Solution

Periodic Table / Transition Elements 2017 O Level Pure Chemistry · Paper 1 · Q24

Question

Element Q has the following properties. • forms QCl₃ when heated with chlorine • forms QSO₄ when reacted with dilute sulfuric acid To which part of the Periodic Table does Q belong?

AGroup II
BGroup III
CGroup IV
Dthe transition elements

Correct answer: D

Video Solution

Explanation

Answer: D. Q forms \(\text{QCl}_3\) (oxidation state +3) and \(\text{QSO}_4\) (oxidation state +2), so Q shows variable oxidation states.

Variable oxidation states are characteristic of the transition elements (for example iron forms \(\text{FeCl}_3\) and \(\text{FeSO}_4\)).

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