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Question

In context with beryllium, which one of the following statements is incorrect ?

A
It is rendered passive by nitric acid
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B
It forms Be2C
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C
Its hydride is electron-deficient and polymeric
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D
Its salts rarely hydrolyse
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Solution

The correct option is D Its salts rarely hydrolyse
1. Beryllium is rendered passive by concentrated HNO3 i.e., it does not react. This is because concentrated HNO3 is a strong oxidising agent and it forms a very thin layer of oxide on surface of the metal, which protects it from further attack by the acid.

2. Beryllium forms carbide, Be2C by heating BeO with C at 19002000oC.

3. Be-Salts are highly covalent and hence are easily hydrolysed.
BeCl2+2HOHBe(OH)2+2HCl

4. (BeH2)n [Beryllium hydride] is electron deficient and is in polymeric form.

Hence, option (c) is correct.

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