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Given that C + O2 →CO2 ;ΔH^o = -a kJ 2CO + O2 → 2CO2; ΔH^o= -b kJ The heat of formation of CO is

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Given that C + O2 →CO2 ;ΔHo = -a kJ 2CO + O2 → 2CO2; ΔHo= -b kJ The heat of formation of CO is

(a) b -2a

(b) 2a-b/2

(c) b-2a/2

(d) 2a-b

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Correct option   (c) b-2a/2

Explanation:

Formation of CO can be written as :

Dividing equation (ii) by 2 and reversing, we get

On adding equations (i) and (iii), we get

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