The standard electrode potential of M ^ + / M in aqueous solution…

$U\,\,\, 1s^2 \,2s^2 \,2p^3$
$V\,\,\, 1s^2\,2s^2 \,2p^6 \,3s^1$
$W\,\,\, 1s^2\,2s^2\, 2p^6\,3s^2\,3p^2$
$X\,\,\, 1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^5\, 4s^2$
$Y\,\,\, 1s^2\, 2s^2\,2p^6\,3s^2\,3p^6\,3d^{10}\, 4s^2\, 4p^6$

Determine which sequence of elements satisfy the following statements :
$(i)$ Element forms a carbonate which is not decomposed by heating
$(ii)$ Element is most likely to form coloured ionic compounds
$(iii)$ Element has largest atomic radius
$(iv)$ Element forms only acidic oxide

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Standard free energies of formation (in $kJ/mol$) at $298\, K$ are $-237.2, -394.4$ and $-8.2 $ for $H_2O_{(l)} , CO_{2(g)}$ and pentane$_{(g)}$ respectively. The value of $E^o_{cell}$ for the pentane-oxygen fuel cell is .......... $V$.

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Which among the following electron transition $(n_2 → n_1)$ in $H-$ atom, minimum change in its orbit radius $(r_2 - r_1) $ is observed-

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Which is the $IUPAC$ name of

$\begin{array}{*{20}{c}}
{\,{C_2}{H_5}} \\
{|\,\,\,\,\,} \\
{C{H_3} - C - C{H_2}Cl} \\
{|\,\,\,\,\,} \\
{\,{C_2}{H_5}}
\end{array}$

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The aqueous solution of aluminium chloride is acidic due to

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Maximum no. of electron in outermost shell of $s, p, d$ and $f$ block elements are respectively

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