Statement (I) : Acidic strength of H₂S > H₂O

Statement (II) : S-H bondenergy < O-H bond energy

In the hydrides of 14^th , 15^th , 16^th & 17^th group ,

Acidic strength is decided by X-H bond enthalpy but not by X-H bond polarity

Down the group as the size of atom increases , affinity with H-atom decreases,

X-H bond enthalpy decreases and thus acidic strength and reducing power increases