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Thermal stability of hydrides of first g...

Thermal stability of hydrides of first group elements follows the order :

A

`LiH gt NaH gt KH gt RbH`

B

`liH gt KH gt NaH gt RbH`

C

`LiH gt RbH gt KH gt NaH`

D

`LiH gt KH gt RbH gt NaH`

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