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Standard VII

Chemistry

Chemical Reaction

When caustic ...

Question

When caustic soda is added to an aqueous solution of copper sulphate, a blue precipitate of $C u (O H)_{2}$ is obtained. How will you separate $C u (O H)_{2}$ from the mixture ?

distillation

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filtration

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evaporation

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crystallization

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Solution

The correct option is B filtration
When caustic soda solution is added to copper sulphate solution, the following reaction takes place:
$C u S O_{4} (a q) + N a O H (a q) \to C u (O H)_{2} (s) + N a_{2} S O_{4} (a q)$
The copper hydroxide precipitate formed can be filtered off as the sodium sulphate is present in the solution in the soluble form.

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Similar questions

Q. Consider the following statements and arrange in the order of true/false as given in the codes.

S_{1}

: When copper sulphate is added to

K_{2} [H g l_{4}]

solution and

S O_{2}

is passed into this solution, white precipitate is obtained.

S_{2}

: When copper sulphate solution is boiled with glucose in presence of caustic soda, a blue precipitate is obtained.

S_{3}

: Pure

C u_{2} C l_{2}

is white, but moist air converts it in to a dark blue material.

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when $H_{2} S (g)$ is passed through this solution?

Q. When an aqueous solution of gas

(X)

is added in excess to a copper sulphate solution, a deep blue color is obtained, then gas is :

Q. An aqueous solution of a gas (X) shows the following reactions :
(i) It turns red litmus blue
(ii) When added in excess to a copper sulphate solution, a deep blue colour is obtained.
(iii) On addition to a ferric chloride solution, a brown precipitate, soluble in dilute nitric acid, is obtained.

Identify (X).

Q. At what pH will

C u (O H)_{2}

start to precipitate from a solution with

[C u^{2 +}] = 0.0015 M

(K_{s p}

for

C u (O H)_{2} = 1.5 \times 10^{- 19})

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When caustic soda is added to an aqueous solution of copper sulphate, a blue precipitate of Cu(OH)2 is obtained. How will you separate Cu(OH)2 from the mixture ?

When caustic soda is added to an aqueous solution of copper sulphate, a blue precipitate of $C u (O H)_{2}$ is obtained. How will you separate $C u (O H)_{2}$ from the mixture ?