Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is
1
LiH > NaH > CsH > KH>RbH
2
LiH < NaH < KH < RbH < CsH
3
RbH > CsH > NaH > KH > LiH
4
NaH > CsH > RbH > LiH > KH
5
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