Which of the following halides cannot be hydrolysed ?

$\begin{matrix} {(I) TeF}_{6} & {(II) SF}_{6} & {(III) NCl}_{3} & {(IV) NF}_{3} \end{matrix}$

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Question

Which of the following halides cannot be hydrolysed ? (I) TeF 6 (II) SF 6 (III) NCl 3 (IV) NF 3 Choose the correct code :

TestHub · Accepted Answer

In SF 6 , S sterically hindered by six fluorine atoms hence, attack of H 2 O molecule will not occur. NF 3 is not hydrolysed due to absence of vacant orbital either on N of F atom. TeF 6 is hydrolysed due to large size of Te. NCl 3 + 4 H 2 O → NH 4 OH + 3 HOCl TeF 6 + 6 H 2 O → 6 HF + H 6 TeO 6 Telluric acid

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