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Q.

out of LiH, MgH2 and CuH

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a

LiH, MgH2 are ionic and CuH covalent hydride

b

all are covalent hydrides

c

LiH is ionic whereas MgH2 and CuH are intermediate hydrides

d

all are ionic hydrides

answer is B.

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Detailed Solution

Hydrides are those chemical compounds in which hydrogen is present in the form of a hydride ion.

Lithium and magnesium are s-block elements and their hydrides are ionic. Ionic hydrides have a crystalline structure and, both lithium hydride and magnesium hydride have a crystalline structure. Copper is a transition element and it forms metallic hydride (or intermediate hydride).

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out of LiH, MgH2 and CuH