Which of the following is correct?

• A

  $\mathrm{SO}_3^2 \Rightarrow$ Tetrahedral
• B

  $\mathrm{NO}_2^{-} \Rightarrow$ Trigonal planar
• Correct answer
  C

  $\mathrm{ClO}_4^{-} \Rightarrow$ Tetrahedral
• D

  $\mathrm{NH}_3 \Rightarrow$ Trigonal planar

Solution

The structure with hybridisation of given compounds are as follows

Hence, the correct answer is option: 'C'.