Which of the following hydrides cannot be obtained by direct reaction between the elements?

BeH₂

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CaH₂

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NaH

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LiH

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Solution

The correct option is A
BeH₂

$2 B e C l_{2} + L i A l H_{4} \to 2 B e H_{2} + L i C l + A l C l_{3}$

Beryllium hydride cannot be obtained directly by reacting elements but when beryllium chloride reacts with lithium aluminium hydride, beryllium hydride is obtained.

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Question 3

Metal hydrides are ionic, covalent or molecular in nature. Among LiH,NaH, KH,RbH,CsH, the correct order of increasing ionic charcter is

(a) LiH > NaH > CsH > KH > RbH

(b) LiH < NaH < KH < RbH < CsH

(d) NaH > CsH > RbH > LiH > KH

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