The alkali metals form salt like hydrides by the direct synthesis at elevated temperature. The termal stability of these hydride

The alkali metals form salt like hydrides by the direct synthesis at elevated temperature. The termal stability of these hydrides decreases in which of the following orders ?
A. NaHgtLiHgtKHgtRbHgtCsH
B. LiHgtNaHgtKHgtRbHgtCsH
C. CsHgtRbHgtKHgtNaHgtLiH
D. KHgtNaHgtLiHgtCsHgtRbH

The alkali metals form salt like hydrides by the direct synthesis at elevated temperature. The termal stability of these hydrides decreases in which o

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