Q.

The reaction of Cu2+ ions with iodide ions gives an intense blue colour when starch is added. By which of the following blue colour disappeared?

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a

SO3-

b

HSO4-

c

S2O3-

d

SO2

answer is C.

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Detailed Solution

When iodine is consumed by S2O3-, blue colour disappears.
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The reaction of Cu2+ ions with iodide ions gives an intense blue colour when starch is added. By which of the following blue colour disappeared?