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In the reaction 2C + O2-> 2CO, if the heat liberated is 10 J, what is the heat of formation of CO?

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In the reaction 2C + O2-> 2CO, if the heat liberated is 10 J, what is the heat of formation of CO?

(a) -5 J

(b) 5 J

(c) -10 J

(d) 10 J
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Right option is (a) -5 J

For explanation: Heat of formation = -10/2 = -5 J.
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