Which one among the following statements is/are not correct?
I. Ba compounds, generally are more covalent than Be compounds.
II. The electron gain enthalpy of $He$ is positive.
III. The oxidation state of $O$ in $OF_{2}$ and $Na_{2} O$ are same.
IV. The radius of $Na^{+}$ ion is smaller than that of $F^{-}$ ion.

Question

Which one among the following statements is/are not correct?
I. Ba compounds, generally are more covalent than Be compounds.
II. The electron gain enthalpy of

He

is positive.
III. The oxidation state of

O

in

OF_{2}

and

Na_{2} O

are same.
IV. The radius of

Na^{+}

ion is smaller than that of

F^{-}

ion.

Accepted Answer

Correct answer: D. (d) The explanation of given statements are: I. As we move down the group, size of atom ion increases while their covalent character decreases. Thus, Ba compounds are less covalent than Be compounds. III. The oxidation state of O in OF_2 is +2 and oxidation state of O in Na_2O is -2 .

Solution

More Periodic Table & Periodicity PYQs