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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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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. CsH gt RbH gt KH gt NaH gt LiH
B. KH gt NaH gt LiH gt CsH gt RbH
C. NaH gt LiH gt KH gt RbH gt CsH
D. LiH gt NaH gt KH gt RbH gt CsH
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Correct Answer - D
As the size of the alkali metal cation increases, thermal stability of their hydrides decreases.
hence, the correct order of thermal stability of alkali metal hydrides is
LiH gt NaH gt KH gt RbH gt CsH
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