Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in

  1. A

    exhibiting maximum covalency in compounds

  2. B

    forming polymeric hydrides

  3. C

    forming covalent halides

  4. D

    exhibiting amphoteric nature in their oxides

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    Solution:

    Due to diagonal relationship, Be and Al exhibits similar properties But covalency of Be is 4 because it has an absence of d-orbital whereas, covalency of Al is up to 6 due to the presence of vacant d-orbital. 
    Hence they differ in (A) Exhibiting the maximum covalency in compounds.

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