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Complete the following equations. a) P bS ( s )+ H _{2} O _{2}( aq ) \rightarrow b) CO ( g )+2 H _{2}( g ) \underset{\text { Catalyst }}{\text { Cobalt }}
CBSE | Chemistry | Class 11 | Hydrogen | NCERT
Complete the following equations. a) P bS ( s )+ H _{2} O _{2}( aq ) \rightarrow b) CO ( g )+2 H _{2}( g ) \underset{\text { Catalyst }}{\text { Cobalt }}

Answer:

(i) PbS (s) + H_2O_2 (aq) → PbSO_4 + 4H_2O

This is a redox reaction. PbS (oxidation state -2) is oxidized to PbSO4 (oxidation state +6) and H2O2 by hydrogen peroxide (oxidation state of O is -1). reduces to H2O (oxidation state of O is -2).

(ii) CO (g) + 2H_2 (g) → CH_3OH

This reaction yields methanol at 340K

i

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