Question

Carbon reduction process is used for the extraction of
A. Hg
B. Zn
C. Cr
D. Fe

Answer 1

Hint: The carbon reaction process is used to extract metals from their oxide ore by reacting with carbon which acts as the reducing agent. The transition metal elements show reduction reaction with carbon.

Complete step by step answer:
The oxide obtained after the calcination process and roasting process is reduced by either carbon or by hydrogen. Carbon is used in the form of coke and carbon monoxide. All metals do not show a reduction process with carbon. The reduction of metal with carbon is based on the reactivity of the metal or the position where the metal is placed in the reactivity series.
The reactivity series is also known as activity series where the metals are placed according to their reactivity. The most reactive metals are placed at the top of the reactivity series and the least reactive metals are placed below in the reactivity series.
The transition metals are extracted from their ores by heating with a reducing agent. The process is known as thermal reduction.
The carbon is used as a reducing agent for the reduction of metal oxides as they are more reactive than the transition metal element.
The reactivity order of metals present in transition elements is shown below.
Zinc > iron > nickel > tin > lead > copper
Zinc and iron both are less reactive than carbon, therefore they both will get reduced by carbon.

So, the correct answer is Option A,D.

Note: During the extraction of metal from its oxide ore, the carbon is oxidized to carbon monoxide where carbon is present in positive oxidation state.