1. The correct order of radii is
a) N < Be < B
b) \[F^{-} < O^{2-} < N^{3-}\]
c) N < Li < K
d) \[Fe^{3+} < Fe^{2+} < Fe^{4+}\]
Explanation: \[F^{-} < O^{2-} < N^{3-}\]
2. Which of the following is the smallest cation?
a) \[Na^{+}\]
b) \[Mg^{2+}\]
c) \[Ca^{2+}\]
d) \[Al^{3+}\]
Explanation: \[Al^{3+}\]
3. The ionic radii of \[N^{3-}, O^{2-}, F^{-},and Na^{+}\] are in the order
a) \[N^{3-} > O^{2-} > F^{-} > Na^{+}\]
b) \[N^{3-} > Na^{+} > O^{2-} > F^{-}\]
c) \[Na^{+} > O^{2-} > N^{3-} > F^{-}\]
d) \[O^{2-} > F^{-} > Na^{+} > N^{3-}\]
Explanation: \[N^{3-} > O^{2-} > F^{-} > Na^{+}\]
4. Ionic radii of
a) \[Ti^{4+} < Mn^{2+}\]
b) \[35_{CI^{-}} < 37_{CI^{-}}\]
c) \[K^{+}>CI^{-1}\]
d) \[P^{3+}>P^{5+}\]
Explanation: \[P^{5+}\] has more effective nuclear charge and smaller size than \[P^{3+}\]
5. The radii of F, F-, O and O2- are in the order
a) \[O^{2-}>F^{-}>F>O\]
b) \[F^{-}>O^{2-}>F>O\]
c) \[O^{2-}>O>F^{-}>F\]
d) \[O^{2-}>F^{-}>O>F\]
Explanation: \[O^{2-}>F^{-}>O>F\]
6. Which stable nucleus has radius half than that of \[^{54}Xe\]
a) \[^{40}Ca\]
b) \[^{23}Na\]
c) \[^{32}S\]
d) \[^{7}Li\]
Explanation: \[^{32}S\]
7. For which of the following ionic species radius would be maximum?
a) \[C^{4-}\]
b) \[N^{3-}\]
c) \[O^{2-}\]
d) \[Mg^{2+}\]
Explanation: Among the isoelectronic species, the anion having more negative charge would be the largest
8. The decreasing order of the size of the following ions is
a) \[Li^{+}>H^{+}>H^{-}\]
b) \[H^{+}>H^{-}>Li^{+}\]
c) \[H^{-}>Li^{+}>H^{+}\]
d) \[H^{-}>H^{+}>Li^{+}\]
Explanation: \[H^{-}>Li^{+}>H^{+}\]
9. Chloride ion and potassium ion are isoelectronic. Then
a) their sizes are same
b) \[CI^{-}\] ion is bigger than \[K^{+}\] ion
c) \[K^{+}\] ion is relatively bigger
d) their sizes depend on either cation or anion
Explanation: \[CI^{-}\] ion is bigger than \[K^{+}\] ion
10. Which has the smallest size?
a) \[Na^{+}\]
b) \[Mg^{2+}\]
c) \[Al^{3+}\]
d) \[P^{5+}\]
Explanation: \[P^{5+}\]