List - I Consider the following metallurgical processes List - II Characteristic Feature (P) Mond's process (1) Metal is oxidised and reduced in successive steps (Q) Bayer's process (2) Meta

Question

List - I Consider the following metallurgical processes List - II Characteristic Feature (P) Mond's process (1) Metal is oxidised and reduced in successive steps (Q) Bayer's process (2) Metal is extracted by electrolytic reduction of its oxide. (R) Hall-Heroult process (3) Metal undergoes no change in oxidation state (S) Gold-Schmidt thermite process (4) Process involves reduction of a metal oxide using another metal as a reducing agent. (5) Process involves formation and decomposition of a volatile intermediate compound. Select the most appropriate matching of List-I with List-II :

TestHub · Accepted Answer

Mond's process (P) forms and decomposes a volatile complex ( $N i (CO)_{4}$ ) without changing the metal's oxidation state ( $0 \to 0$ ), matching 3 and 5.

Bayer's process (Q) is a leaching process where aluminum remains in the $+ 3$ oxidation state throughout, matching 3.

Hall-Heroult process (R) involves the electrolytic reduction of molten $A l_{2} O_{3}$ to extract aluminum metal, matching 2.

Gold-Schmidt thermite process (S) uses aluminum metal as a reducing agent to reduce metal oxides (like $F e_{2} O_{3}$ ), matching 4.

Chemistry - Metallurgy Question with Solution | TestHub

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Doubts & Discussion

List - I Consider the following metallurgical processes	List - II Characteristic Feature
(P) Mond's process	(1) Metal is oxidised and reduced in successive steps
(Q) Bayer's process	(2) Metal is extracted by electrolytic reduction of its oxide.
(R) Hall-Heroult process	(3) Metal undergoes no change in oxidation state
(S) Gold-Schmidt thermite process	(4) Process involves reduction of a metal oxide using another metal as a reducing agent.
	(5) Process involves formation and decomposition of a volatile intermediate compound.