Iron and nickel are used to make electro chemical cell by using a salt bridge to join a half cell containing $1\;M\;Fe^{2+}(aq)$ in which a strip of irons has been immersed to a second half cell which contain $1\;M\;Ni^{2+}(aq)$ in which a strip of Ni has been immersed ? A voltmeter is connected between the two metal strips : $E^{0} _{Fe^{2+}/Fe} =-0.44 V; \qquad E^{0} _{Ni^{2+}/Ni} =-0.25 V$ a) Write the name of the cathode and anode . b) Write the half reaction involved ? c) What would be the effect on the voltmeter reading if $Fe^{2+}$ concentration were increased ?

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