Chemistry · Classification of Elements and Periodicity in Properties

What is the formula of the highest oxide formed by Group 13 elements (boron family)?

1. A
   \( \text{B}_2\text{O}_3, \text{Al}_2\text{O}_3, \text{Ga}_2\text{O}_3, \text{In}_2\text{O}_3 \)
2. B
   \( \text{Li}_2\text{O}, \text{Na}_2\text{O}, \text{K}_2\text{O} \)
3. C
   \( \text{CO}_2, \text{SiO}_2, \text{GeO}_2 \)
4. D
   \( \text{N}_2\text{O}_5, \text{P}_4\text{O}_{10}, \text{As}_2\text{O}_5 \)