Question

a copper coin is kept in a solution of silver nitrate for some time what will happen to the coin and the colour of the soltion

Answer 1

displacement reaction will take place as copper is more reactive than silver.
Cu(s)+ 2Ag(No3)2(sol.). =2 Ag(s)+ Cu(No3)2 (sol.)
the solution would turn to blue and some grey solid crystal would appear on copper coin