The cell potential for the given cell at 298 K

Pt| H₂ (g, 1 bar) | H⁺ (aq) || Cu²⁺ (aq) | Cu(s)

is 0.31 V. The pH of the acidic solution is found to be 3, whereas the concentration of Cu²⁺ is 10^$-$x M. The value of x is ___________.

(Given : $E_{C{u^{2 + }}/Cu}^\Theta$ = 0.34 V and ${{2.303\,RT} \over F}$ = 0.06 V)

Consider the cell

$\mathrm{Pt(s)|{H_2}(g)\,(1\,atm)|{H^ + }\,(aq,[{H^ + }] = 1)||F{e^{3 + }}(aq),F{e^{2 + }}(aq)|Pt(s)}$

Among $\mathrm{VO}_2^{+}, \mathrm{MnO}_4^{-}$ and , the spin-only magnetic moment value of the species with least oxidising ability is __________ BM (Nearest integer).

In a cell, the following reactions take place

$\begin{aligned} &Fe^{2+} \to Fe^{3+} + e^- & E^\circ_{Fe^{3+}/Fe^{2+}} = 0.77 \text{ V} \\ &2I^- \to I_2 + 2e^- & E^\circ_{I_2/I^-} = 0.54 \text{ V} \end{aligned}$

For the given reactions

Sn²⁺ + 2e^$-$ $\to$ Sn

Sn⁴⁺ + 4e^$-$ $\to$ Sn

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula $\mathrm{M}_2 \mathrm{O}_{\mathrm{n}}$ (where ). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is _________ (near integer)

The mass of zinc produced by the electrolysis of zine sulphate solution with a steady current of $0.015 \mathrm{~A}$ for 15 minutes is _________ $\times 10^{-4} \mathrm{~g}$.

The number of paramagnetic species from the following is _____________.

$\mathrm{{[Ni{(CN)_4}]^{2 - }},[Ni{(CO)_4}],{[NiC{l_4}]^{2 - }}}$

Total number of moles of AgCl precipitated on addition of excess of AgNO$_3$ to one mole each of the following complexes $\mathrm{[Co(NH_3)_4Cl_2]Cl,[Ni(H_2O)_6]Cl_2,[Pt(NH_3)_2Cl_2]}$ and is ___________.

(a) CoCl₃.4NH₃,  (b) CoCl₃.5NH₃,    (c) CoCl₃.6NH₃  and   (d) CoCl(NO₃)₂.5NH₃.

Number of complex(es) which will exist in cis-trans form is/are _______________.

The difference between spin only magnetic moment values of $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]\mathrm{Cl}_{2}$ and is ___________.