When sodium hydroxide solution is added to copper sulphate solution, a blue precipitate of copper hydroxide is formed along with sodium sulphate solution. What kind of chemical reaction takes place between them?

Chemical combination reaction

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Chemical decomposition reaction

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Chemical displacement reaction

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Chemical double decompostion reaction

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Solution

The correct option is A

Chemical double displacement reaction.
The reaction undergoing is: $2 N a O H + C u S O_{4} \to N a_{2} S O_{4} + C u (O H)_{2}$

A double displacement reaction is a chemical reaction between two compounds in which constituents of each compound are interchanged to form two new compounds (AB+CD=AD+CB), so the reaction is a double displacement reaction.

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