MCQ
$HCO_3^-$ is a conjugate acid of :-
- A$H_2CO_3$
- B$HCOOH$
- ✓$CO_3^{2-} $
- D$CO_2$
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$X + \frac{1}{2}{O_2}\,\, \to \,\,XO + 90.8\,kJ$
It follows that the heat of reaction for the following process $M + XO$ $\rightleftharpoons$ $MO + X$ is given by......$kJ$

Reason : Graphite is a good conductor.