Solve this following

Question:

The number of $\mathrm{S}=\mathrm{O}$ bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are :

 

  1. 2,3 and 4

  2. 1,4 and 3

  3. 2,4 and 3

  4. 1,4 and 4

Correct Option: , 4

Solution:

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