salt reacts with potassium iodide to give

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Canvas Classes · Accepted Answer

Step 1 — Reaction of  with :

Or equivalently:

Step 2 — Analyse the reaction:
-  is reduced to  (gain of 1e⁻ per Cu)
-  is oxidised to  (loss of 1e⁻ per I)
-  combines with  to form  (cuprous iodide)

Step 3 — Product identification:
 = cuprous iodide (white precipitate)
 = iodine (brown, detected by starch indicator turning blue)

This reaction is the basis of the iodometric determination of .

Answer: Option (1) —

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