Complete the following equations :
$(i) PbS_{(s)} + 4H_2O_{2_{(aq)}} \to$
$(ii) CO_{(g)} + 2H_{2_{(g)}} \xrightarrow{\text{cobalt catalyst}}$

(N/A) $(i)$ When $PbS$ reacts with hydrogen peroxide,it forms $PbSO_4$ and water.
$PbS_{(s)} + 4H_2O_{2_{(aq)}} \to PbSO_{4_{(s)}} + 4H_2O_{(l)}$
$(ii)$ Methanol is formed by the reaction of carbon monoxide with $H_2$ gas in the presence of a cobalt catalyst.
$CO_{(g)} + 2H_{2_{(g)}} \xrightarrow{\text{cobalt catalyst}} CH_3OH_{(l)}$