Question

a student placed a silver bangle in a copper sulphate solution expecting to see a brown deposit of copper on the bangle. what happened

Answer 1

No reaction take place. silver being less reactive than copper doesn't react with copper and doesn't form any coating

Answer 2

As we know that copper is more reactive than silver. Copper displaces silver from its salt solution becoz of which you can see a reddish brown deposit on the bangle
Equation:
Cu+AgSO4------ CuSO4+ Ag