The alkali metals form salt like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following order ?

The alkali metals form salt like hydrides by the direct synthesis at e

1.	The alkali metals form salt like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following order ?
Answer» `NaH GT LIH gt KH gt RbH gt CsH` `LiH gt NaH gt KH gt RbH gt CsH` `CsH gt RbH gt KH gt NaH gt LiH` `KH gt NaH gt LiH gt CaH gt RbH` Solution :As bond length increase bond energy decreases their by thermal stability decreases down the GROUP