Discussion
[NO2]+ has a shape similar to :
Answer: B
\([\text{NO}_{2}]^{+}\) has a shape similar to \(\text{SiO}_{2}\), taken as the linear O=Si=O unit.
The nitronium ion is isoelectronic with CO2: nitrogen has two double bonds to oxygen and no lone pair, so it is linear (sp, AX2). A monomeric SiO2 unit, with silicon in the same group as carbon, would likewise be linear. (Solid silica is a network of SiO4 tetrahedra, but the question compares the triatomic formula.)
SO2 and O3 have a lone pair on the central atom (AX2E) and are bent at about 119° and 117°; water has two lone pairs and is bent at 104.5°. None of them is linear.
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