The green coloured complex ion of nickel in its aqueous solution is

The strongest $CO$ bond is present in

Which of the following complexes does not give a precipitate with $AgNO_3$ solution?

Which complex is most stable? Where $k_d =$ Dissociation constant.

Which of the following statements is $NOT$ consistent with the ability of transition metal ions to form complex compounds?

$5.33 \text{ g}$ of $CrCl_3 \cdot 6H_2O$, which is a $1:3$ electrolyte, is dissolved in water and passed through a cation exchanger. The chloride ions in the eluted solution, on treatment with $AgNO_3$, result in $8.61 \text{ g}$ of $AgCl$. The ratio of moles of complex reacted and moles of $AgCl$ formed is . . . . . . $\times 10^{-2}$. (Nearest integer) [Molar mass in $\text{g mol}^{-1}$: $Cr = 52, Ag = 108, Cl = 35.5, H = 1, O = 16$]