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Paramjeet verma
option (b) The synthesis uses a Co2+ species rather than a Co3+ salt, because the aqueous Co(H2O)6 3+ ion is very unstable because it is a powerful oxidizing agent and is reduced by water to Co(H2O)6 2+. Co(H2O)6 3+ + ½ H2O → Co(H2O)6 2+ + ¼ O2 + H+