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Question

Beryllium and aluminium exhibit many properties which are similar. But, they differ in:

A
Forming covalent halides
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B
Forming polymeric hydrides
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C
Exhibiting maximum covalency in compounds
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D
Exhibiting amphoteric nature in their oxides
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Solution

The correct option is C Exhibiting maximum covalency in compounds
Due to diagonal relationship, Be and Al have many similar properties. However, they differ in exhibiting maximum covalency.
Maximum covalency of Be=4
Maximum covalency of Al=6
This is due to the absence of d-orbitals in Be.

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