Which one of the following has (have) octahedral geometry?
(i) $S b C l_{6}^{-}$
(ii) $S n C l_{6}^{2 -}$
(iii) $X e F_{6}$
(iv) $I O_{6}^{5 -}$ .

(i), (ii) and (iv)

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(i), (iii) and (iv)

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(i), (ii) and (iii)

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All of these

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Solution

The correct option is A (i), (ii) and (iv)
Except (iii) i.e. $X e F_{6}$ , all other show octahedral geometry.
$X e F_{6}$ has $6 σ$ bonds and one alone pair of electrons, hence show distorted octahedral structure also known as pentagonal bipyramidal with one lone pair.
All other shows octahedral geometry.

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Which of the following are isobars?

i) $_{18}^{40} A r$
ii) $_{6}^{14} C$
iii) $_{20}^{40} C a$
iv) $_{7}^{14} N$

I F_{5}

H_{2} O

B F_{3}

C C l_{4}

E_{2}

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