Please help Which of the following reactions is an example of a double displacement reaction?
Select one:
a. NaCN + HBr --> NaBr + HCN
b. K + Cl2 --> KCl
c. C6H14 + O2 --> CO2 + H2O
d. H2O2 --> H2O + O2

2) Which of the following reactions is an example of a double displacement reaction?
Select one:
a. CH4 + O2 --> CO2 + H2O
b. Na2S + HCl --> NaCl + H2S
c. KClO3 --> KCl + O2
d. Fe + S8 --> FeS