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Potassium Permanganate

If potassium ...

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:
$3 F e^{2 +} + 2 [F e (C N)_{6}]^{3 -} \to F e_{3} [F e (C N)_{6}]_{2}$

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

Q. Choose the correct answer:
The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is:
A. Iron (III) sulphate
B. Iron (II) sulphate
C. Iron (II) chloride
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Q. The questions (i) to (v) refer to the following salt solutions listed (a) to (f):
(a) Copper nitrate
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(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
(ii) Which two solution will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

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C. Iron (III) chloride
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Q. A white powder solid A forms a light green solution with water, which on treatment with potassium hexacyanoferrate(III) gives a blue precipitate. On being strongly heated, A leaves a
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B a C l_{2}

solution containing concentrated HCl. A is:

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