See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

                   2 2 2 3 2 1 Co O Co 2OH Net 2 1 2, Net 1 2 2     2 2 2Co O 2Co 4OH           2 2 2 2 3 2CoCl Na O 2NaOH 2H O 2Co OH 4NaCl        Sum total of stoichiometric coefficients of all the reactants = 2 + 1 + 2 + 2 = 7