Question

H2o, h2s,h2se,h2te increasing order of thermal stability

Answer 1

H2te<H2se<H2s <H2o
as we go top to bottom in periodic table....the bond dissociation enthalpy decreases.

Answer 2

Answer:

The increasing order of thermal stability is given as follows:

H2O > H2S > H2Se > H2Te

Explanation:

These are the hydrides of group 16 of the periodic table and the thermal stability of these compounds decreases as we go down the group.

Therefore, the hydride of oxygen has the highest thermal stability among all while that of tellurium has the lowest. It is because dissociation energy of the bond between the elements(M) and hydrogen(H) decreases down the group with an increase in the size of the atom situated at the centre.