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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 than Al. (III) Charge/radius ratio of Be is greater than that of Al. (IV) Both Be a
- #Engineering
- #s- Block Elements ( Alkali and Alkaline earth metals )
- #Chemistry
- #Joint Entrance Examination Main
Among the statements (I–IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II)Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.
Option: 1 (I), (II) and (IV)
Option: 2 (I), (III) and (IV)
Option: 3 (II), (III) and (IV)
Option: 4 (I), (II) and (III)
Answers (1)
(I) Be has a smaller atomic radius compared to Mg, in a group atomic radius increases.
(II) Be has higher ionization enthalpy than Al due to fully filled s-block orbital of Be.
(III) Charge/radius ratio of Be is greater than that of Al, due to Be being small.
(IV) Only Al form mainly covalent compounds, Be forms ionic compounds.
(I), (II), and (IV) are correct.
Therefore, Option 1 is correct.
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