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Colourless solutions of the following fo...

Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution turn blue.

A

`KNO_3`

B

`AgNO_3`

C

`Zn(NO_3)_3`

D

`ZnSO_4`

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The correct Answer is:
B
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