A) \[{{H}_{2}}S\]
B) \[{{H}_{2}}O\]
C) \[{{H}_{2}}Se\]
D) \[{{H}_{2}}Te\]
Correct Answer: D
Solution :
The thermal stability of the hydrides of VI A group (i.e.,\[{{H}_{2}}O\]to\[{{H}_{2}}Te\])is as: \[{{H}_{2}}O>{{H}_{2}}S>{{H}_{2}}Se>{{H}_{2}}Te\]and the acidic character increases from\[{{H}_{2}}O\]to\[{{H}_{2}}Te\]is as: \[{{H}_{2}}O<{{H}_{2}}S<{{H}_{2}}Se<{{H}_{2}}Te\] Hence,\[{{H}_{2}}Te\]has lowest thermal stability and maximum acid strength.
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