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Giving suitable reasons, arrange the hydrides of group 16 elements in the decreasing order of their thermal stability.

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Giving suitable reasons, arrange the hydrides of group 16 elements in the decreasing order of their thermal stability.

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  • The thermal stability of hydrides decreases in the order of H2O > H2S > H2Se > H2Te. 
  • Since atomic size increases from O to Te, the tendency to form hydride bond, M-H decreases. 
  • Hence M-H bond in O-H is the strongest and in TeH the weakest. Therefore thermal stability decreases from H2O to H2Te. 
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