Answer:
Option B
Explanation:
C(s)+O2(g)→CO2(g);△H1=−x ...........(i)
CO(g)+12O2(g)→CO2(g);△H2=−y ...........(ii)
For the formation of CO subtract Eqs.(ii) from (i) i.e,
C(s)+O2(g)→CO2(g)
CO(g)(−)+12O2(g)(−)→CO2(g)(−)_
C(s)+12O2(g)→CO(g)_
∴ △rH for formation of CO= △H1−△H2
=-x+y or y-x