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2017 O Level Chem P1 Q30 — Metals / Extraction and Reactivity Solution

Metals / Extraction and Reactivity 2017 O Level Pure Chemistry · Paper 1 · Q30

Question

Which statement about metals and their compounds is not correct?

AHeating magnesium powder with iron(III) oxide produces iron and a white smoke containing magnesium oxide.
BMetals low in the reactivity series are generally extracted from their oxides by heating with carbon.
CUnreactive metals are likely to be found as elements in soils or rocks.
DWhen using hydrogen, higher temperatures are needed to reduce copper(II) oxide to copper than are needed to reduce zinc oxide to zinc.

Correct answer: D

Video Solution

Explanation

Answer: D. The statement that is not correct is D. A more reactive metal holds its oxygen more strongly, so its oxide is harder to reduce and needs a higher temperature.

Zinc is more reactive than copper, so zinc oxide needs a higher temperature than copper(II) oxide, the opposite of what D states. The other statements are correct.

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