TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
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 \(\mathrm{He}\) is positive. III. The oxidation state of \(\mathrm{O}\) in \(\mathrm{OF}_2\) and \(\mathrm{Na}_2 \mathrm{O}\) are same. IV. The radius of \(\mathrm{Na}^{+}\)ion is smaller than that of \(\mathrm{F}^{-}\)ion.
- A I, III, IV
- B II
- C II, III, IV
- D I, III
Answer & Solution
Correct Answer
(D) I, III
Step-by-step Solution
Detailed explanation
The explanation of given statements are: I. Both beryllium ( \(\mathrm{Be}\) ) and barium ( \(\mathrm{Ba}\) ) belongs to the same group (i.e. group-II) and as we move down the group, size of atom/ion increases while their covalent character decreases. Thus, Ba compounds are…
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