MCQ
Which reagent can be used to identify nickel ion
- AResorcinol
- ✓Dimethyl glyoxime $ [DMG]$
- CDiphenyl benzidine
- DPotassium ferrocyanide

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the number of sigma and pi bonds respectively are
$\left. \begin{gathered}
(A)\,\,\xrightarrow{{PB{r_3}}}\,(C)\,\xrightarrow{{Mg\,,\,ether}}Grignard\,\,reagent \hfill \\
(A)\,\,\xrightarrow[{{H_2}S{O_4}}]{{N{a_2}C{r_2}{O_7}}}\,(B) \hfill \\
\end{gathered} \right\}$ $ \to \,(D)\xrightarrow{{{H_3}{O^ \oplus }}}$ $(3,4-$ dimethyl $3-$ hexanol$)$
Given : Mass of electrons $=9.1 \times 10^{-31}\, \mathrm{~kg}$
Charge on an electron $=1.6 \times 10^{-19}\, \mathrm{C}$
Planck's constant $=6.63 \times 10^{-34\,} \mathrm{Js}$
