Question

(i) a Redox reaction which is also combination reaction
(ii) a Redox reaction which is also displacement reaction

Answer 1

1) Combination Reactions. This type of reaction refers to redox reactions only when both the species (A & B) or either of the species are present in their elemental form. This type of redox reaction (oxidation and reduction) reaction is just the opposite of the decomposition reaction.

Answer 2

CaO + CO2 = Ca(OH)2

H2SO4 + Mg = MgSO4 + H2