MCQ
Which has permanent dipole moment ?
- A$CO_3^{-2}$
- B$SO_4^{-2}$
- C$CS_2$
- ✓$NH_3$

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$(I)$ $NO + Br_2 \rightleftharpoons NOBr_2 $ ........ Fast
$(II)$ $NOBr_2 + NO \rightarrow 2NOBr$ ......... Slow
The overall order of this reaction is

$C(s) + O_2(g) \to CO_2(g) + x\ kJ$
$CO(g) + \frac {1}{2}O_2(g) \to CO_2(g) + y\,kJ$
The heat of formation of $CO(g)$ is