`H_(2)S` is a stronger acid than `H_(2)O`. Explain

Assertion : H_(2)S is stronger acid than PH_(3) . Reason : S is more electronegative than P, conjugate base HS^(− ) is more stable than H_(2)P^(−) .

In hypophosphorous acid P is in +1 state (H_(3)PO_(2)) and in phosphoric acid (H_(3) PO_(4)) Pis in +5 state but still H_(3)PO_(2) is stronger than H_(3)PO_(4) . Explain.

Assertion : H_(2)O_(2) decomposes carbonates and bicarbonates to evolve CO_(2) gas. Reason : H_(2)CO_(3) is stronger acid than H_(2)O_(2) .

H_(2)S is. more acidic than H_(2)O because

(a) Draw the structures of the following molecules : (i) N_(2)O_(5) (ii) HCIO_(4) (b) Explain the following observations : (i) H_(2)S is more acidic than H_(2)O . Fluorine does not exhibit any positive oxidation state . (iii) Helium forms no real chemical compound.