Question

During electrochemical reduction method, the melt constituents are composed of which of the following materials?

(a) Non metal oxide, alkali nitride, sulphide

(b) Metal nitride, nonmetal halide, carbide

(c) Nonmetal sulphide, alkali carbide, nitride

(d) Metal oxide, alkali borate, alkali halide

I have been asked this question in an international level competition.

Question is from Electrochemical Reduction Methods in chapter Preparative Methods of Solid State Chemistry

Answer 1

Right choice is (d) Metal oxide, alkali borate, alkali halide

To explain I would say: In electrochemical reduction method, electrolysis of melt constituents take place resulting in a crystalline compound formation. These melt constituents are made up of metal oxide, alkali borate (or phosphate or carbonate, etc) and an alkali halide.