Tarnished silver ware is cleaned by placing it in an aluminium pan as E°cell is positive.
Explanation:
The tarnish silver due to silver sulphate is removed by placing the tarnished ware in an aluminium pan. Certainly, aluminium is a stronger reducing agent than silver. Hence, it reduces the silver ions(Ag+) to metallic silver. The silvery white white colour will slowly get deposited on the walls of silwer ware and then the tarnish will be removed.
Al(s)+ 3Ag+ (aq)→ Al3+ (aq)+ 3Ag(s)
E° cell = E ° cathode - E° anode
 = (-0.71)- (-1.66) = 0.95 V is positive.
Hence, the reaction is feasible and the tarnish will be removed.
The electrochemical principle behind the procedure is aluminum is a strong reducing agent.
Electrochemical reaction is the reaction in which the electrons flow between a solid electrode.
The reaction is [tex]Ag^2S (s) + 2e- 2Ag (s) + S-2 (aq) is -0.71 V[/tex]
E° cell = E ° cathode - E° anode
(-0.71)- (-1.66) = 0.95 V is positive.
Thus, the  electrochemical principle behind the procedure is aluminum is a strong reducing agent.
Learn more about electrochemical reaction
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