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NTA Abhyas JEE Main2020Chemistryp Block Elements (Group 15, 16, 17 & 18)Practice

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

Options

  1. AIII and IV
  2. BI, II and III
  3. CI, II and IV
  4. DII and IV

Correct answer

D. II and IV

Step-by-step solution

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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