Question

Pls help what type of reaction has taken place in the following chemical equations( 1) 2 Hgo GIVES 2Hg plus O2 (2) Pbo2 plus So2 gives PbSo4 (3) AgNo3 +Nacl gives Agcl + Nano3 (4) CuO + H2 gives Cu + H2O

Answer 1

decomposition reaction
combination reaction
double displacement
redox reaction