Question
Arrange the following hydrides of group 16 elements in order of increasing stability.
A.
$${H_2}S < {H_2}O < {H_2}Te > {H_2}Se$$
B.
$${H_2}O < {H_2}Te < {H_2}Se < {H_2}S$$
C.
$${H_2}O < {H_2}S < {H_2}Se < {H_2}Te$$
D.
$${H_2}Te < {H_2}Se < {H_2}S < {H_2}O$$
Answer :
$${H_2}Te < {H_2}Se < {H_2}S < {H_2}O$$
Solution :
There is a decrease in bond enthalpy $$(H - E)$$ as the size of the element increases on moving down the group hence, the stability decreases on moving down the group.