A cell with two electrodes, one of grey tin and the other of white tin, both dipping in a solution of (NH_4)_2SnCl_6 , showed zero emf at 18^ . What conclusion may be drawn from this?

JEE Main Chemistry question

A cell with two electrodes, one of grey tin and the other of white tin, both dipping in a solution of , showed zero emf at C. What conclusion may be drawn from this?

(A)The emf developed at the electrode-solution phase boundary cancels the normal emf
(B)Grey tin, being non-metallic, ceases to provide a reversible electrode reaction
(C)The electrode surface develops a protective layer, giving the cell a very large internal resistance
(D)The standard Gibbs energy change of the cell is zeroCorrect

Answer: (D)

Solution

Since , a measured emf of zero directly and most simply indicates that $Δ

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Question ID VK-143908