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Standard XII

Chemistry

Potassium Permanganate

A metal carbo...

Question

A metal carbonate, on being heated strongly gives a solid that forms a green solid with $C o O$ . In which analytical group will the cation be precipitate and what will be the colour of the precipitate?

Group I, white

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Group II, yellow

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Group III, white

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Group IV, white

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Solution

The correct option is D Group IV, white
ZnO forms a green solid with CoO.
$Z n O + C o O \to C o Z n O_{2} cobalt zincate (green)$
ZnO is obtained when zinc carbonate is heated.
$Z n C O_{3} Δ - \to Z n O + C O_{2}$
$Z n^{2 +}$ belongs to fourth group. It is precipitated as white precipitate of ZnS (zinc sulphide) that is insoluble in ammonium hydroxide.

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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

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

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A metal carbonate, on being heated strongly gives a solid that forms a green solid with CoO. In which analytical group will the cation be precipitate and what will be the colour of the precipitate?

A metal carbonate, on being heated strongly gives a solid that forms a green solid with $C o O$ . In which analytical group will the cation be precipitate and what will be the colour of the precipitate?