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In which of the following reactions heat liberated is known as standard heat of formation of $CO_2$ ?


( A ) $CH_4 +2O_{2(g)} \to CO_{2(g)} + 2H_2O_{(l)}+212.8 \;kcal$
( B ) $C_{(graphite)} +O_{2(g)} \to CO_{2(g)} + 94.05 \;kcal$
( C ) $2CO_{(g)} +O_{2(g)} \to 2CO_{2(g)} + 135.5 \;kcal$
( D ) $C_{(diamond)} +O_{2(g)} \to 2CO_{2(g)} + 94.5 \;kcal$

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