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A student added zinc strip to a solution...

A student added zinc strip to a solution of `CuSO_4`. After several minutes, he observed that the blue colour of solution changed and a layer got deposited on zinc strip. The colour of the solution and that of the coating would respectively be ______

A

green, black

B

colourless, black

C

colourless, reddish brown

D

green, reddish brown

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