MCQ
Which of the following ions form most stable complex compound[
- ✓$C{u^{ + 2}}$
- B$N{i^{ + 2 }}$
- C$F{e^{ + 2 }}$
- D$M{n^{ + 2 }}$
$M{n^{2 + }} < F{e^{2 + }} < C{o^{2 + }} < N{i^{2 + }} < C{u^{2 + }} < Z{n^{2 + }}$
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$C{r_2}O_7^{2 - } + F{e^{2 + }} + {C_2}O_4^{2 - } \to C{r^{3 + }} + F{e^{3 + }} + C{O_2}$ (Unbalanced)
$1$. $NH_3 + NH_4Cl$
$2$. $HCl + NaCl$
$3$. $NH_3 + HCl$ in $2 : 1$ $mole$ ratio
Select the correct answer using the code given below
[Atomic mass $: \mathrm{Na}=23.0, \mathrm{O}=16.0, \mathrm{H}=1.0]$

