1.

Write the order of thermal stabillity of the hydrides of group 16 elements.

Answer»

Solution :As the size of the element increases down the GROUP, the E-H bond length increases. In other words, the E-H bond DISSOCIATION energy decreases and hence E-H bond breaks more easily. Thus, the thermal stability of the hydrides of group 16 elements decreases downthe group, i.e., `H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te gt H_(2)Po`.


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