MCQ
Among Group $16$ elements, which one does $NOT$ show $-2$ oxidation state?
- A$\mathrm{Se}$
- B$\mathrm{Te}$
- ✓$\mathrm{Po}$
- D$0$
Selenium shows $-2,+2,+4$ and $+6$ oxidation states
Tellurium shows $-2,+2,+4$ and $+6$ oxidation states
Polonium shows $+2$ and $+4$ oxidation states
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The equilibrium constant of the reaction $2N{H_3} + \frac{5}{2}{O_2} \rightleftharpoons 2NO + 3{H_2}O$ in terms of $K_1, K_2$ and $K_3$ is
$Image$
is/are
$B.E(N -N) = 159\, kJ\, mol^{-1}$,
$B.E(H -H) = 436\, kJ\, mol^{-1}$
$B.E.(N \equiv N) = 941\, kJ\, mol^{-1}$,
$B.E(N -H) = 398\, kJ\, mol^{-1}\, .......\,kJ\, mol^{-1}$