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In the given figure, the filter paper contains starch soaked in potassium iodide solution is connected to the battery as shown. When we write on the wet paper, it has a blue black colour.

(i) Iodine is formed at the anode
(ii) Iodine turns blue black in the presence of starch.

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Only (i) is correct

Both (i) and (ii) are correct

Neither (i) nor (ii) is correct

Only (ii) is correct

answer is C.

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Detailed Solution

Thus, violet colour of anode is due to formation of iodine and its subsequent reaction with starch. Pink colour at cathode is due to formation of OH^- ions which also render the solution alkaline. OH^- ions give Pink colour with phenolphalein

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