MHT CET 2025 Chemistry question
If standard reduction potential () of () and () are -0.25 V and -1.66 V respectively. What is standard emf of cell reaction 2Al_{(s)} + 3Ni^{+2}_{(aq)} \rightarrow 2Al^{+3}_{(aq)} + 3Ni(s)
Answer: (C)
Solution
In the cell reaction Al is oxidised (anode) and is reduced (cathode). E^\circ_{cell} = E^\circ_{cathode} - E^\circ_{anode} = E^\circ(Ni^{2+}/Ni) - E^\circ(Al^{3+}/Al) = (-0.25) - (-1.66) = +1.41 V. The stoichiometric coefficients (2 and 3) do not multiply the potential, since is an intensive
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