Among the following metals, the most dense is

$\begin{array}{*{20}{c}}
{\,\,\,\,\,C{H_3}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O{\mkern 1mu} } \\
{\,\,\,|{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} ||} \\
{C{H_3} - CH - C - OH}
\end{array}$ $+ C{H_3} - N{H_2} \to 'A'\xrightarrow[\Delta ]{}'B'\xrightarrow{\begin{subarray}{l}
{\text{LiAl}}{{\text{H}}_4} \\
{\text{(excess)}}
\end{subarray} }'C'$

The final product $‘C’$ will be

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For the cell reaction, $2C{{e}^{4+}}+Co\to 2C{{e}^{3+}}+C{{o}^{2+}}$ $E_{cell}^o$ is $1.89\,V$ and $E_{Co/C{o^{2 + }}}^o = + 0.28.$ If $E_{C{e^{4 + }}/C{o^{3 + }}}^o$ ............. $\mathrm{V}$

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What is the isomerism between the complexes $\left[ Co \left( NH _3\right) Br \right] SO _4$ and $\left[ Co \left( NH _3\right)_3 SO _4\right] Br$ ?

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Which of the following is obtained when chloral is boiled with $NaOH$

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Which of the following tendencies remains unchanged on going down in the nitrogen family (Group - $V-A$) ?

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Which of the following is not an actinide?

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