MCQ
$S—O$ bond length is maximum in
- A$SO_2$
- B$SO_3$
- C$SO_4^{-2}$
- ✓$SO_3^{-2}$

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$(a)$ Effective nuclear charge for nitrogen is $3.90$
$(b)$ $IP$ of $Ne$ is more than $Na^+$
$(c)$ Order of electron negativity $sp > sp^2 > sp^3$
$(d)$ Order of acidic character $NH_3 < PH_3 < AsH_3$