Which is the correct thermal stability order for H
2
E (E=O, S, Se, Te and Po)?
- AH
2
S2
O2
Se2
Te2
Po - BH
2
O2
S2
Se2
Te2
Po - CH
2
Po2
Te2
Se2
S2
O - DH
2
Se2
Te2
Po2
O2
S
Solution & Step-by-step Explanation
Thermal stability of hydrides of Group 16 elements decreases down the group. This is because as the size of the central atom (E) increases, the H−E bond length increases and the bond dissociation enthalpy decreases.
Order: H
2
O>H
2
S>H
2
Se>H
2
Te>H
2
Po.
Order: H
2
O>H
2
S>H
2
Se>H
2
Te>H
2
Po.