MCQ
In an exothermic reaction $\Delta H$ is
- APositive
- ✓Negative
- CZero
- DBoth positive or negative
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$MgO(s) + C(s) \to Mg(s) + CO(g)$, for which $\Delta _r{H^o} = + 491.1\,kJ\,mo{l^{ - 1}}$ and $\Delta _r{S^o} = 198.0\,Jk^{-1}\,mo{l^{ - 1}}$ is not feasible at $298\, K$. Temperature above which reaction will be feasible is.....$K$
$2{H_2}{O_2}(l) \rightleftharpoons {H_2}O(l) + {O_2}(g)$
$(R = 83\, JK^{-1}\, mol^{-1})$
$STATEMENT$-$2$: $o$-Hydroxybenzoic acid has intramolecular hydrogen bonding.
