JEE Chemistry 2026 Question with Solution

Given: Two statements are to be checked. Statement I concerns the nature of Group $14$ oxides, and Statement II concerns the properties of $BF_3$.

Find: Which option correctly describes the truth values of Statement I and Statement II.

For Statement I, examine each pair:

• [$SiO_2$, $CO_2$]: both are acidic oxides, so this pair does not qualify.
• [$SnO$, $SnO_2$]: both are amphoteric oxides, so this pair qualifies.
• [$PbO$, $PbO_2$]: both are amphoteric oxides, so this pair qualifies.
• [$GeO$, $GeO_2$]: $GeO_2$ is amphoteric, but $GeO$ is not typically classified as amphoteric, so this pair does not qualify.

Thus, the number of pairs in which both oxides are amphoteric is exactly $2$. Therefore, Statement I is true.

For Statement II:

• $BF_3$ is electron deficient because boron has only six electrons around it.
• Therefore, $BF_3$ can act as a Lewis acid.
• It forms an adduct with $NH_3$ as $F_3B \leftarrow NH_3$.
• With three bond pairs and no lone pair on boron, its geometry is trigonal planar.

Hence, Statement II is true.

Therefore, both Statement I and Statement II are true. The correct option is C.