A) CsH > RbH > KH > NaH > UH
B) KH > NaH > LiH > CsH > RbH
C) NaH > LiH > KH > RbH > CsH
D) LiH > NaH > KH > RbH > CsH
Correct Answer: D
Solution :
Key Idea: Small anion forms stable compounds with small cation. The thermal stability of alkali metal hydrides decreases as: \[LiH>NaH>KH>RbH>CsH\] because the size of cation increases as: \[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<R{{b}^{+}}<C{{s}^{+}}\]You need to login to perform this action.
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