WAEC - Chemistry (2018 - No. 3)
Which of the following equations represents a redox reaction?
\(HNO_{{3}{(aq)}} + NaOH_{(aq)} \to NaNO_{{3}{(aq)}} + H_{2}O_{(l)}\)
\(AgNO_{{3}{(aq)}}+KCl_{(aq)} \to AgCl_{(s)}+KNO_{{3}{(aq)}}\)
\(CaCO_{{3}{(s)}} \to CaO_{(s)} + CO_{{2}{(g)}}\)
\(2H_{2}S_{(s)} + SO_{{2}{(g)}} \to 2HO_{2} + 3S_{(g)}\)