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Question

If potassium hexacyanoferrate (III) solution is added to the suspected iron solution,iron (II) ions give precipitate of _____________colour .

A
Blue
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B
Pink
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C
Red
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D
Turnbulls Blue
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Solution

The correct option is B Turnbulls Blue
Iron(ll) ions on reaction with hexacyanoferrate (III) ions forms blue coloured precipitates of iron (II) hexacyanoferrate (III) as:
3Fe2++2[Fe(CN)6]3Fe3[Fe(CN)6]2

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