The evidence that supports the student's inference is a dark solid formed on the zinc.
Chemical reaction of zinc metal with CuSO4
When zinc is added to copper sulphate (CuSO4) solution, due to more reactivity of zinc, copper is replaced by zinc and forms zinc sulphate precipate.
Thus, the student is correct, there will be a chemical reatcion between the zinc and copper sulphate (CuSO4) solution, producing a dark solid substance.
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