MCQ
Which of the following species contains minimum number of atoms in $'XY'$ plane?
- A$XeF^-_5$
- ✓$SF_6$
- C$IF_7$
- DAll

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[Given: Solubility product of $PbSO _4\left(K_{s p}\right)=1.6 \times 10^{-8}$. For $H _2 SO _4, K_{a l}$ is very large and $\left.K_{a 2}=1.2 \times 10^{-2}\right]$
Reason : The presence of additional $d-$ electron offer poor screening effect for the outer electrons from increased nuclear charge.
$NO _{3}^{-}, H _{2} O _{2}, BF _{3}, PCl _{3}, XeF _{4},SF _{4}, XeO _{3}, PH _{4}^{+}, SO _{3},\left[ Al ( OH )_{4}\right]^{-}$