MCQ
The correct statement in respect of $d-$ block elements
- AThey are all metals
- BThey show variable valency
- CThey form coloured ions and complex salts
- ✓All above statements are correct
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$'X'\,\,\xrightarrow{{water}}$ Insoluble
$'X'\xrightarrow{{5\% \,HCl}}$ Insoluble
$'X'\xrightarrow{{10\% \,NaOH}}$ Insoluble
$'X'\xrightarrow{{10\% \,NaHC{O_3}}}$ Insoluble
$\mathop {{H_2}(Pt)}\limits_{1\,atm} \left| {\begin{array}{*{20}{c}}
{H_{aq}^ + }\\
{pH = 4}
\end{array}} \right|\left| {\begin{array}{*{20}{c}}
{A{g^ + }}\\
{xM}
\end{array}} \right|\begin{array}{*{20}{c}}
{Ag}\\
{}
\end{array}$
What is the value of $x$ ? ........... $\mathrm{M}$
( give : $E_{A{g^ + }|Ag}^o = + 0.8$ $\frac{{2.303\,RT}}{F} = 0.06 $)
$E_{\frac{1}{2}Cl_2/Cl^- }^o = 1.36\,V\,,\,E_{C{r^{3 + }}/Cr}^o = - 0.74\,V$
$E_{C{r_2}O_7^{2 - }/C{r^{3 + }}}^o = 1.33\,V\,,\,E_{MnO_4^ - /M{n^{2 + }}}^o = 1.51\,V$
The correct order of reducing power of the species $(Cr, Cr^{3+}, Mn^{2+}$ and $Cl^-)$ will be