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A student add lead and silver to two dif...

A student add lead and silver to two different test tubes containing an equal amount of copper sulphate solution . The student observed that the colour of solution in the test tube with lead changes .What explains the change in the colour of the solution?
(a) A displacement reaction takes place as lead displaces copper from the solution.
(b) A combination reaction takes place as lead combines with sulphate in the solution.
(c) A double displacement reaction takes place as silver combines with sulphate in the solution.
(d) A decomposition reaction takes place as copper dissociates from sulphate in the solution.​

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