Q2 of 26 Page 1

Arrange the following hydrides of Group-16 elements in the increasing order of their thermal stability: H2O, H2S, H2Se, H2Te

Thermal stability decreases in going down the group. On moving down the group, the size of central atom i.e. anion increases because of which the bond strength between hydrogen and central atom decreases which further results in decrease in thermal stability. Therefore, increasing order of thermal stability is H2Te< H2Se< H2S< H2O.


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