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Assertion: $\mathrm{NF}_3$ is a weaker ligand than $\mathrm{N}\left(\mathrm{CH}_3\right)_3$. Reason : $\mathrm{NF}_3$ ionizes to give $\mathrm{F}^{-}$ions in aqueous solution.
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If assertion is true but reason is false
Due to high electronegativity of F-atoms, the lone pair of $\mathrm{N}$-atom in $\mathrm{NF}_3$ molecule cannot be ligated easily.
Except, nitrogen fluoride, all other halides hydrolyse in water.
$$
\mathrm{NCl}_3+3 \mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{NH}_3+3 \mathrm{HClO} \text {. }
$$
Except, nitrogen fluoride, all other halides hydrolyse in water.
$$
\mathrm{NCl}_3+3 \mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{NH}_3+3 \mathrm{HClO} \text {. }
$$
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