AP EAMCET202120 Aug 2021Evening ShiftChemistryHydrogenActual
The correct order of acidic character of the following is:
Options
- AH 2 O > H 2   S > H 2 Se > H 2 Te
- BH 2 Se > H 2   S > H 2 O > H 2 Te
- CH 2 Te > H 2 Se > H 2   S > H 2 O
- DH 2 Te > H 2   S > H 2 Se > H 2 O
Correct answer
C. H 2 Te > H 2 Se > H 2   S > H 2 O
Step-by-step solution
The acidity is directly proportional to the tendency of the hydrogen donor. It depends upon the bond dissociation enthalpy of the X - H bond where X is Te , Se , S   &   O . Down the group the bond dissociation energy of hydrides decreases and the acidic strength increases. Hence, the correct order of acidic character of the given hydrides is H 2 Te > H 2 Se > H 2   S > H 2 O .