Question: The following table shows the standard reduction potentials for various metals at 298 K. Metal ion/metal Fe 3+ /Fe Zn 2+ /Zn Cr 3+ /Cr

The following table shows the standard reduction potentials for various metals at 298 K.

Metal ion/metal Fe3+/Fe Zn2+/Zn Cr3+/Cr V2+/V
E -0.04 V -0.76 V -0.74 V -1.13 V

(a) i. Identify the MOST suitable half-cell to pair with chromium half-cell for chromium electrode to get eroded.

ii. Suggest a half-cell that would give voltage value of 0.72 V. Draw the electrochemical diagram, write the balanced half-reaction, overall cell reaction equations and cell notation for the diagram.

iii. In a different experiment, some water is added to anode electrolyte and the voltage value increased to 0.75 V. Determine the new concentration of anode electrolyte.

(b) Identify the spontaneity of the following reactions :

i. A cell consists silver (Ag) and standard hydrogen electrode (SHE). Will SHE oxidise Ag to Ag+?

ii. A cell consists of silver (Ag) and Copper (Cu). Will Ag oxidise Cu to Cu2+?

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