Assign $A, B, C, D$ from the given type of reaction:
$3KCN + Fe(CN)_3 \downarrow \longrightarrow K_3[Fe(CN)_6]$

Which of the following complexes has the lowest molar conductivity in solution?

$A$ solution contains $2.675 \ g$ of $CoCl_3 \cdot 6NH_3$ $(M = 267.5 \ g/mol)$. When passed through a cation exchanger,the chloride ions liberated are treated with excess $AgNO_3$ to yield $4.78 \ g$ of $AgCl$ $(M = 143.5 \ g/mol)$. What is the formula of the coordination compound?

Which of the following complexes has the highest stability at $298 \ K$?

Assertion : $NF_3$ is a weaker ligand than $N(CH_3)_3$.
Reason : $NF_3$ ionizes to give $F^{-}$ ions in aqueous solution.

The complex that dissolves in water is