Are the following reaction equations right?

Question

Pb(s) + CuSO4 (aq) --> PbSO4 (aq) + Cu(s)
Fe(s) + CuSO4 (aq) --> Fe SO4 (aq) + Cu(s)
Zn + CuSO4 (aq) --> Cu + Zn SO4
Al+ CuSO4 --> Al(SO4)3 + Cu
Mg(s) + CuSO4(aq) --> MgSO4(aq) + Cu(s)

Answer 1

four are right
one is non-balanced

2Al + 3 Cu (SO4)---> Al2 (SO4)3 +3Cu

Answer 2

Out of these equations 4 are feasible.

The first equation is not correct because lead cannot displace copper from its solution. This is because copper is a stronger reducing agent than lead.

The rest of the equations are right. Only aluminuum sulphate should be Al2(SO4)3, and that equation needs to be balanced.