With the halp of ionic equations describe what happen: When (i) pH of a solution of dichromate ions is raised. (ii) Potassium manganate is electro-chemically oxidised.
when pH is increased, i.e., solution is more basic, orange coloured dichromate ion change to yellow coloured chromate ion. When potassium manganate is electro-chemically oxidised i.e., undergoes, electrolytic oxidation, it forms purple colour KMnO4.
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State two advantages of H2O fuel cell over ordinary cell.
The standard reduction potential values of three metal cations Xa+, Yb+ and Zc+are + 0.52, – 3.03, – 1.18 V respectively. Arrange the corresponding metals, in the order of their increasing reducing power.
Explain with the help of a diagram the effect of change in concentration of solution on the molar conductance of (i) a weak electrolyte, (ii) a strong electrolyte.
Explain why: (i) E° for Mn3+ / Mn2+ couple is more positive than that Fe3+/Fe2+. (At. No. Mn = 25, Fe = 26). (ii) Ce3+ can be easily oxidised to Ce4+ (At. No. Ce= 58).
