MCQ
In an exothermic reaction $\Delta H$ is
- APositive
- ✓Negative
- CZero
- DBoth positive or negative
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$Gas$ $(A)$ bums with a blue flame and is oxidised to $gas$ $(B)$,
$Gas\left( A \right) + C{l_2} \to \left( D \right)\xrightarrow{{N{H_3},\Delta }}\left( E \right)$.
$A,B, C$ and $E$ are