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Iron Ion

Colour of the...

Question

Colour of the precipitate formed on adding NaOH solution to iron (II) sulphate solution is (a)White (b) Brown (c) Green (d) Pale blue.

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Solution

Ferrous sulphate and Sodium hydroxide produce, ferrous hydroxide which is pale blue in colour.
$2 N a O H + F e S O_{4} \to F e (O H)_{2} + N a_{2} S O_{4}$

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Select the correct answers :

(a) Colour of an aqueous solution of copper sulphate is

(i) Green (ii) Brown (iii) Blue (iv) Yellow

(b) Colour of the precipitate formed on adding $N a O H$ solution to iron (II) sulphate solution is

(i) White (ii) Brown (iii) Green (iv) Pale blue

(c) A metal which produces hydrogen on reacting with alkali as well as with acid.

(i) Iron (ii) Magnesium (iii) Zinc (iv) Copper

What is the precipitate formed on passage of Ammonia gas through copper sulphate solution which looks pale blue?

Q. A certain pale-green substance

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becomes dark brown on adding

N a N O_{2}

in presence of dilute

H_{2} S O_{4}

. Its aqueous solution gives precipitates with

B a C l_{2}

N a O H

in separate tests. The latter precipitate

B

gradually changes colour from green to brown on exposure to air. What is

A

?

Q. (a) Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess sodium hydroxide solution. Name the metal ion present in solution A.
(b) When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. Name the cation present in solution B. What is the probable colour of solution B?

Q. An aqueous blue coloured solution of a transition metal sulphate reacts with

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