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JEE Chemistry · Medium

s-Block Elements: Alkaline earth metals MCQ

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Alkaline earth metalsMediumQuestion 880003

Question

Beryllium (Be) is anomalous in Group 2 because:
  1. A
    It forms covalent compounds (high charge density, small size, no d-orbitals)
    Correct
  2. B
    It is radioactive
  3. C
    It has +1 oxidation state
  4. D
    It reacts explosively with water

Correct answer

It forms covalent compounds (high charge density, small size, no d-orbitals)

Explanation

Be²⁺ has very high charge density (small size + 2+ charge). It polarises anions strongly → forms covalent compounds (BeCl₂ is covalent, unlike MgCl₂ which is ionic). Be also shows amphoteric behaviour unlike other Group 2 metals.

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