Home › TYS Solutions › O Level Chem › 2017 › P1 Q31

2017 O Level Chem P1 Q31 — Metals / Extraction of Iron Solution

Metals / Extraction of Iron 2017 O Level Pure Chemistry · Paper 1 · Q31

Question

Which statement about the extraction of iron in a blast furnace is correct?

AHaematite, containing mainly iron(II) oxide, is reduced.
BLimestone is used as a catalyst.
CSlag is formed due to a reaction between an acidic oxide and a basic oxide.
DThe main impurity in the iron formed is slag.

Correct answer: C

Video Solution

Explanation

Answer: C. Slag is calcium silicate, formed when the basic oxide calcium oxide reacts with the acidic oxide silicon dioxide.

A is wrong (haematite is iron(III) oxide). B is wrong (limestone is not a catalyst; it removes impurities). D is wrong (the main impurity in the iron is carbon, and the slag is run off separately).

Get the Sec 3 / Sec 4 recording package

Every O Level Pure Chemistry TYS MCQ solution video, plus full Sec 3 / Sec 4 topic recordings.