Statement-I: Lithium hydride is the stablest of all the alkali metal hydridesStatement-II: The lattice energies of alkali metal halides decrease as the size of the halide ion increases

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Statement-I: Lithium hydride is the stablest of all the alkali metal hydrides
Statement-II: The lattice energies of alkali metal halides decrease as the size of the halide ion increases

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I is false and II is true

Both the statements are true

I is true and II is false

Both the statements are false

answer is A.

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Detailed Solution

I) Stability
$large xrightarrow{{LiH; > ;NaH; > ;KH; > ;Rb; > ;CsH}}$
As the size of alkali metal ↑^es, the ionic bond strength ↓^es i.e., LiH is most stable alkali metal hydride whereas CsH is least stable alkalimetal hydride
II) Question Image

Reason: As the size of halide ion ↑^es attractive force on the halide ion ↓ i.e., lattice energy ↓^es
$large therefore L.E propto;frac{1}{size;of;anion;(or);cation}$