what type of reaction is for Pb(NO3)2 + CuSO4 → PbSO4 + Cu(NO3)2

is it decomposition
or synthesis
or double replacement

2 answers

DOUBLE REPLACEMENT (OR DOUBLE DISPLACEMENT)
Pb(NO3)2 + CuSO4 → PbSO4 + Cu(NO3)2
Note that it is
AB2 + CD ==> AD + CB2