Of the following reactions?

Question

Of these reactions, which one(s) is a combustion reaction?

1) CuSO4 + Fe

2) CuCO3 + heat

3) Mg + H2SO4

4) KI + Pb(NO3)2

5) Cu + AgNO3

6) CuSO4 x 5H2O + heat

7) Mg + heat

8) H20 + elec

Answer 1

Number 7.