Which of the following complexes can show both facial ( $f a c$ ) and meridional (mer) isomerism?
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]$
$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$
$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_3 \mathrm{Cl}_3\right]$
$\left[\mathrm{Ni}(\mathrm{CO})_4\right]$
In the diazotisation of aniline with sodium nitrite and hydrochloric acid the excess of hydrochloric acid is used primarily to
neutralise the base liberated
ensure a stoichiometric amount of nitrous acid
suppress the hydrolysis of phenol
suppress the concentration of free aniline
Identify the product $Q$ in the following reaction sequence,





Which of the following complex ions is expected to appear colourless in aqueous solution?
$\left[\mathrm{Zn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$
$\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}$
$\left[\mathrm{CoCl}_4\right]^{2-}$
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