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Standard XII

Chemistry

Colour

Which of the ...

Question

Which of the following statement(s) is (are) not correct with reference to ferrous and ferric ions?

F e^{3 +}

gives brown colour with potassium ferricyanide

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F e^{2 +}

gives blue ppt with potassium ferricyanide

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F e^{3 +}

gives red colour with potassium sulphocyanide

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F e^{2 +}

gives brown colour with potassium sulphocyanide

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Solution

The correct option is D $F e^{2 +}$ gives brown colour with potassium sulphocyanide
$F e^{3 +} + 2 K C N S \to [F e (S C N)]^{2 +}$ (Red coloured ppt.)
$F e^{3 +}$ gives red ppt with KCNS and not $F e^{2 +}$ .

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Similar questions

Q. Which of the following statement(s) is/are correct with reference to

F e^{2 +}

and

F e^{3 +}

ions ?

F e^{3 +}

gives brown colour with potassium ferricyanide
2.

F e^{2 +}

gives blue colour with potassium ferricyanide
3.

F e^{3 +}

gives red colour with potassium thiocyanate
4.

F e^{2 +}

gives brown colour with ammonium thiocyanate

Q. Aqueous solution of light greenish crystalline compound reacts with potassium ferricyanide to give a deep blue coloured solution or precipitate. Its chemical formula is:

{F e}^{2 +}

gives blue colour, called Turnbull's blue with

K_{3} [{F e (C N)}_{6}]

While

{F e}^{3 +}

gives blue colour, called Prussian blue with

K_{4} [{F e (C N)}_{6}]

If the given statement is true enter 1 else enter 0.

Q. If true enter 1, else enter 0.
The gas liberated on heating a mixture of two salts with

N a O H

, gives a reddish brown precipitate with an alkaline solution of

K_{2} {H g I}_{4}

. The aqueous solution of the mixture on treatment with

{B a C l}_{2}

gives a white precipitate which is sparingly soluble in conc.

H C l

. On heating the mixture with

K_{2} {C r}_{2} O_{7}

an conc.

H_{2} {S O}_{4}

, red vapours (A) are produced. The aqueous solution of the mixture gives a deep blue colouration (B) with potassium ferricyanide solution. The radicals in the given mixture are

F e^{2 +}, N H_{4}^{+}; S O_{4}^{2 +}, C l^{-}

(A) :

C r O_{2} C l_{2}

Q. The gas liberated on heating a mixture of two salts with

N a O H

, give a reddish brown precipitate with an alkaline solution of

K_{2} H g l_{4}

. The aqueous solution of the mixture on treatment with

B a C l_{2}

gives a white precipitate which is sparingly soluble in concentrated

H C l

. On heating the mixture with

K_{2} C r_{2} O_{7}

and concentrated

H_{2} S O_{4}

, red vapour

(A)

are produced. The aqueous solution of the mixture gives a deep blue ppt.

(B)

with Potassium ferricyanide solution. Identify the radicals.

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Which of the following statement(s) is (are) not correct with reference to ferrous and ferric ions?

The correct option is D Fe2+ gives brown colour with potassium sulphocyanideFe3++2KCNS→[Fe(SCN)]2+(Red coloured ppt.)Fe3+ gives red ppt with KCNS and not Fe2+.

The correct option is D $F e^{2 +}$ gives brown colour with potassium sulphocyanide
$F e^{3 +} + 2 K C N S \to [F e (S C N)]^{2 +}$ (Red coloured ppt.)
$F e^{3 +}$ gives red ppt with KCNS and not $F e^{2 +}$ .