Colourless solution of silver nitrate is taken in two test tubes A and B. Metal plates of copper and platinum are dipped into test tubes, A and B respectively. Content of test tubes ____________.

B turns green

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B turns blue

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A turns blue

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A remains colourless

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Solution

The correct option is C A turns blue
In test tube A, displacement reaction takes place as copper being more reactive displaces silver from silver nitrate solution thus leading to the formation of copper nitrate which is blue in colour. The chemical reaction can be written as:
$C u + A g (N O_{3})_{2} \to C u (N O_{3})_{2} + A g$

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