Which of the following statements about beryllium compared with the rest of group 2 are correct?

ABeryllium reacts vigorously with cold water to liberate hydrogen
BAnhydrous BeCl2 acts as a Lewis acid
CBeO is amphoteric while MgO is basic
DBe forms the complex ion $[BeF X_{4}] X^{2 -}$ with coordination number 4

Answer: B, C, D

BeO is amphoteric, Be has four orbitals available and forms

[BeF X_{4}] X^{2 -}

, and the electron-deficient BeCl2 accepts electron pairs. Be is protected by an oxide film and does not react with cold water or steam, unlike Ca, Sr and Ba.

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