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Q.

Which of the following precipitate is formed when copper sulphate is treated with sodium hydroxide solution?

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a

Sodium Sulphate

b

None of the above

c

Copper Hydroxide

d

Sodium Hydroxide

answer is A.

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Detailed Solution

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When copper sulphate is treated with sodium hydroxide the compound of blue colour that forms is called copper hydroxide precipitate.
Copper sulphate reacts with sodium hydroxide to form a blue precipitate of copper hydroxide and sodium sulphate. It is a double displacement reaction and is also called a precipitation reaction due to the formation of a blue precipitate called copper hydroxide. The reaction can be shown as follows:

CuS O_{4} (s) + 2 NaOH (l) \to Cu (OH)_{2} ↓ + {Na}_{2} S O_{4} (l)

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