Which of the following methods are not used to refine any metal?
(A) Liquation
(B) Calcination
(C) Electrolysis
(D) Leaching
(E) Distillation
Choose the correct answer from the options given below

We need to identify which of the given methods are not used for refining metals.

We classify each method as follows. (A) Liquation: This is a refining method. It is used to refine metals with low melting points (like tin, lead, bismuth). The impure metal is heated on a sloped surface; the pure metal melts and flows away from the higher melting impurities.

(B) Calcination: This is a concentration/extraction method, NOT a refining method. Calcination involves heating the ore below its melting point in the absence of air to remove moisture, CO$$_2$$, and other volatile impurities from the ore. It is used in the early stages of extraction.

(C) Electrolysis: This is a refining method. Electrolytic refining is used for metals like copper, zinc, nickel, silver, and gold. The impure metal is made the anode and pure metal is deposited at the cathode.

(D) Leaching: This is a concentration method, NOT a refining method. Leaching involves selectively dissolving the ore in a suitable solvent (like NaOH for bauxite in Bayer's process) to separate it from impurities.

(E) Distillation: This is a refining method. Distillation refining is used for metals with low boiling points (like zinc and mercury). The impure metal is evaporated and then condensed to get pure metal.

Among these methods, calcination (B) and leaching (D) are concentration/extraction methods, not refining methods.

The correct answer is Option A: B and D only.