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2018 O Level Chem P1 Q31 — Metals / Extraction of Metals Solution

Metals / Extraction of Metals 2018 O Level Pure Chemistry · Paper 1 · Q31

Question

Metals are found naturally as the metal or as metal compounds. The metal compounds can be reduced to the metal using carbon as a reducing agent or by electrolysis. Which row is correct? Question diagram

Question diagram

A
B
C
D

Correct answer: C

Video Solution

Explanation

Answer: C. A metal's reactivity decides how it is obtained. Only the least reactive metals (silver, gold, platinum) are found native as the free metal. Metals below carbon in the reactivity series (such as iron and zinc) are extracted by reduction with carbon. Metals above carbon (such as magnesium, sodium and potassium) are too reactive for carbon and are extracted by electrolysis.

Row C is correct: silver found as the metal; iron and zinc reduced by carbon; magnesium and potassium by electrolysis. The other rows misplace magnesium as a free metal or sodium as carbon-reduced. Answer C.

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