MCQ
Incorrect order of size
- A$Zn > Cu > Ni$
- B$O^{-2} > F^-> Na^+$
- ✓$O^{-2} > Cl^-> S^{-2}$
- D$I^-> Br^-> Cl^-$
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[Given: Solubility product of $PbSO _4\left(K_{s p}\right)=1.6 \times 10^{-8}$. For $H _2 SO _4, K_{a l}$ is very large and $\left.K_{a 2}=1.2 \times 10^{-2}\right]$

$N_2(g) + 3H_2(g) \to 2NH_3(g$) is
$-92.38\, KJ$ at $298\, K$. The internal energy change $\left( {\Delta U} \right)$ at $298\, K$ is ........$KJ$