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Q.

When copper turnings are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because, copper

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a

oxidises silver from  the solution

b

forms a blue coloured complex with AgNO3

c

is oxidised to Cu2+

d

is reduced to Cu2+

answer is C.

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Detailed Solution

Cu + 2 AgNO3 Cu(NO3)2 + 2Ag +

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