(A) 2CO(g)  +  O2(g)  →  2CO2(g)                        ∆Hθ=− x kJ mol−1 
(B) C(graphite)  +  O2(g) →  CO2(g)                   ∆Hθ=− y kJ mol−1 
The ∆Hθ for the reaction
C(graphite) +   O2(g) →  CO(g) is

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Answer: Option 1

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