Questions 1 4 And 5 Attached

Answer 4)
Co2+ + H+ + H2O2—gt; Co3+ + H2O + OH(Co2+ to Co3+) —-Oxidation
H2O2 ==gt; H20 (O1- to O2-) —–Reduction
Co2+ is the reducing agent here which itself is getting oxidised to Co3+
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