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Reactivity with Halogens and Hydrogen (Group 2)

On reaction o...

Question

On reaction of sodium hydroxide with copper ion gives the coloured precipitate. Tell the colour.

A

Blue/Turquoise

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B

Pink

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C

Red

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D

White

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Solution

The correct option is A Blue/Turquoise
Copper(ll) ions $C u^{2 +}$ react with sodium hydroxide to form blue coloured precipitates of copper(ll) hydroxide as:
$C u^{2 +} + 2 O H^{-} \to C u (O H)_{2} (s)$

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