Rock salt is an ore of one of the following metals. This metal is: (a) Mn (b) Na (c) Fe (d) Cu
(b) Na Rock salt is a chloride ore of sodium. The name of the compound in the ore is sodium chloride with chemical formula NaCl.
Which of the following is an ore of mercury metal? (a) rock salt (b) cinnabar (c) duralumin (d) zinc amalgam