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Answers
Answer 1: Minerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock that are high enough to be economically extracted for use. All ores are minerals, but all minerals are not necessarily ores.
Answer2: Most zinc is used to galvanise other metals, such as iron, to prevent rusting. Galvanised steel is used for car bodies, street lamp posts, safety barriers and suspension bridges. Large quantities of zinc are used to produce die-castings, which are important in the automobile, electrical and hardware industries.
Answer3 Froth floatation mainly used for separation of sulphide ores. ... The complex is formed which prevents ZnS from coming to froth. Therefore NaCN acts as a depressant which prevents ZnS in froth floatation reaction.