![]() In an acid solution, Co (II) is more stable than Co (III). The oxidation state free energy diagram shows that the most common and important chemical compounds of cobalt are formed in +2 and +3 oxidation states. The metal cobalt reacts with most of the halogens like fluorine, chlorine, bromine, and other non-metals like boron, carbon, phosphorus, and sulfur on heating.It is a ferromagnetic metal with a high curie point (1121 ☌).The hardness and tensile strength of the metal are greater than those of steel. ![]()
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