MCQ
Which of following do not exist
- A$SH_6$
- B$HFO_4$
- C$FeI_3$
- ✓All
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$HSO_4^- = 1.2 \times 10^{- 2} ,H_2PO_4^- = 6.3 \times 10^{-8} ,$$HCO_3^- = 4.7 \times 10^{-11}$

Reason : Covalency of oxygen is two.