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When a student put some copper turnings in a colourless solution, he observed that the solution gradually turned blue. The solution is mostly likely to be

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FeS O_{4}

solution

Mg (N O_{3})_{2}

solution

AgN O_{3}

solution

CuS O_{4}

solution.

answer is C.

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Detailed Solution

The solution is likely to be the solution of

AgN O_{3}

. The above reaction will be a displacement reaction where a more reactive element will displace a less reactive element. For copper to perform a displacement reaction, the

Cu

has to displace the metal cation from the solution. Since

Fe

and

Mg

are more reactive than

Cu

hence,

Cu

cannot displace them from the solution. But in the case of

AgN O_{3}

Ag

has a lower reactivity than

Cu

and hence can be displaced by

Cu

AgN O_{3}

also is a colourless solution which turns blue when

Cu

displaces

Ag

and forms

Cu (N O_{3})_{2}

Cu + AgN O_{3} \to Cu (N O_{3})_{2} + Ag

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