• # question_answer The increasing thermal stability of the hydrides of group 16 follows the sequence A)  ${{H}_{2}}O,\,{{H}_{2}}S,\,{{H}_{2}}Se,\,{{H}_{2}}Te$B)  ${{H}_{2}}Te,{{H}_{2}}Se,\,{{H}_{2}}S,\,{{H}_{2}}O$C)  ${{H}_{2}}S,{{H}_{2}}O,{{H}_{2}}Se,\,\,{{H}_{2}}Te$D)  ${{H}_{2}}Se,\,{{H}_{2}}S,{{H}_{2}}O,\,{{H}_{2}}Te$

As the size of the central atom M in ${{H}_{2}}M$ increases from O to $Te,$the H-M bond becomes weaker and breaks easily on heating. Hence, ${{H}_{2}}O$ is most stable and ${{H}_{2}}Te$is least stable.