Chemistry · PYQ NEET UG 2016(2)

Which of the following pairs of ions is isoelectronic and isostructural?

1. A
   \( \text{ClO}_3^-, \text{SO}_3^{2-} \)
2. B
   \( \text{CO}_3^{2-}, \text{NO}_3^- \)
3. C
   \( \text{ClO}_3^-, \text{CO}_3^{2-} \)
4. D
   \( \text{SO}_3^{2-}, \text{NO}_3^- \)