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Among the statements (I – IV), the correct ones are: (I) Be has smaller atomic radius compared to Mg. (II) Be has higher ionization enthalpy then Al. (III) Charge/radius ratio of Be is greater than that of Al. (IV) Both Be and Al form mainly covalent compounds.

1. (1) (I), (II) and (III)
2. (2) (I), (II) and (IV)
3. (3) (I), (III) and (IV)
4. (4) (II), (III) and (IV)

Correct answer: (2) (I), (II) and (IV)

Solution

(I) Be radius < Mg radius: true. (II) IE of Be (~899) > Al (~577): true. (IV) Be and Al both form mainly covalent compounds: true. (III) is the doubtful one. The valid combination is (I),(II) and (IV).

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