Q10 / 54 · JEE Advanced 2017 (Paper 1) · Chemistry

The sum of the number of lone pairs of electrons on each central atom in the following species is  TeBr62-, BrF2+, SNF3 and XeF3- [Atomic number : N = 7, F = 9, S = 16, Br = 35, Te = 52, Xe = 54]

Correct answer: 6

Solution

  Number of σ-bonds formed by central metal atom/ ion Number of lone pairs on central metal atom/ ion
(i)  In ⁡TeBr62-  6  1
(ii) In⁡BrF2+   2   2
(iii)  In⁡SNF3  4  0
(iv)  In⁡XeF3-  3  3

⇒    Total number of lone pairs of electrons =1+2+0+3

=6

Hence, the correct answer is 6.

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