State two advantages of H2O fuel cell over ordinary cell.
Answer: The advantage of water fuel cell over ordinary cell is, (i) It has high-efficiency and eco-friendly. (ii) The H2O produced can be used by astronauts for drinking purposes.
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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).
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.
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.
