1.

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

Answer»

`CsHgtRbHgtKHgtNaHgtLiH`
`KHgtNaHgtLiHgtCsHgtRbH`
`NaHgtLiHgtKHgtRbHgtCsH`
`LiHgtNaHgtKHgtRbHgtCsH`

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