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Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH the correct order of increasing ionic character is
A. `LiH gt NaH gt CsH gt KH gt RbH`
B. `LiH gt NaH gt KH gt RbH gt CsH `
C. `RbH gt CsH gt NaH gt KH gt LiH`
D. `NaH gt CsH gt RbH gt LiH gt KH`

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(b) is the correct increasing ioninc character of alkali metal huydrides.

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