Isoelectronic Species

Q. The radius of isoelectronic species:

1. Same for all.

2. Decreases with increase in nuclear charge.

3. First increases and then decreases.

4. Increases with decrease in nuclear charge.

Q. Which of the following species is isoelectronic with $C{O}_2$?

1. $N_3^{-}$
2. $(CNO{)}^{-}$
3. $(NCN{)}^{2-}$
4. All of these

Q.

In which pair are the two species Isoelectronic?

1. $\mathrm{Ne},{\mathrm{F}}^{-}$

2. $\mathrm{Ar},{\mathrm{Be}}^{2+}$

3. $\mathrm{K},{\mathrm{F}}^{-}$

4. ${\mathrm{S}}^{2-},\mathrm{He}$

Q. Which one of the following group of atoms or ions is not isoelectronic?

1. He, H^-, Li⁺

2. Na+, Mg²⁺, Al³⁺

3. F^-, O^2-, N^3-

4. K⁺, Ca²⁺, Ne

Q. During polarization of ion distortion of the ion that is, attraction of electron cloud towards cation happens due to what reason ??

Q.

Which of the following is not isoelectronic series -

1. 

2. 

3. 

4. 

Q.

Consider the following species:

N^3–, O^2–, F^–, Na⁺, Mg²⁺ and Al³⁺

(a) What is common in them?

(b) Arrange them in the order of increasing ionic radii.

Q.

Which one of the following is an example of positive ion and negative ion that is isoelectronic with $F^{-}$?

1. and or

2. and or

3. and or

4. and or

Q.

Which is the correct order for ionic radii?

1. 

2. 

3. 

4. None of the above

Q. Which among the following are isoelectronic $N{O}_3^{-},C{O}_3^{2-},Cl{O}_3^{-},S{O}_2$

1. NO₃^-, CO₃^2-, ClO₃^-

2. NO₃^-, CO₃^2-, SO₂

3. CO₃^2-, ClO₃^-, SO₂

4. None of these

Q. Which one of following species are isoelectronic? $S^{2-},N{a}^{+},C{a}^{2+},C{l}^{-}$

1. $S^{2-},N{a}^{+},C{a}^{2+},C{l}^{-}$
2. $N{a}^{+},C{a}^{2+},C{l}^{-}$
3. $S^{2-},N{a}^{+},C{l}^{-}$
4. $S^{2-},C{a}^{2+},C{l}^{-}$

Q.

Which one of the following is an example of a positive ion and negative ion that is isoelectronic with $F^{-}$?

1. $S^{2-}$ and $M{g}^{2+}$ or $N{a}^{+}$

2. $O^{2-}$ and $C{a}^{2+}$ or $K^{+}$

3. $O^{2-}$ and $M{g}^{2+}$ or $L{i}^{+}$

4. $O^{2-}$ and $M{g}^{2+}$ or $N{a}^{+}$

Q.

In the iso electronic species the ionic radii ($A^O$) of $N^{3-}$, $O^{-2}$, $F^{-}$ are respectively given by

1. 1.36, 1.40, 1.71

2. 1.36, 1.71, 1.40

3. 1.71, 1.40, 1.36

4. 1.71, 1.36, 1.40

Q. For the isoelectronic species of $N^{3-},O^{2-}$ and $F^{-}$ the ionic radii $\left(\stackrel{\circ }{A}\right)$ are respectively

1. 1.36, 1.40, 1.71
2. 1.36, 1.71, 1.40
3. 1.71, 1.36, 1.40
4. 1.71, 1.40, 1.36

Q.

Which of the following are isoelectronic species i.e., those having the same number of electrons?

Na⁺, K⁺, Mg²⁺, Ca²⁺, S^2–, Ar

Q.

The size of iso electronic species $F^{-}$ , $Ne$ and $N{a}^{+}$ is affected by

1. Nuclear charge (Z)

2. None of the factors because their sizes the same.

3. Valence principal quantum number (n)

4. Electron-electron interaction in the outer orbitals

Q.

The number of isoelectronic species among the following are:
$C{a}^{2+},Ar,C{l}^{-},K^{+},Kr,F^{-}$

1. $2$
2. $4$
3. $5$
4. $6$

Q. The radius of isoelectronic species?

1. Increases with a decrease in nuclear charge.
2. Decreases with an increase in nuclear charge.
3. Same for all.
4. First increases and then decreases.

Q.

The size of isoelectronic species $F^{\ominus }$, $Ne$ and $N{a}^{\oplus }$ is affected by

1. Nuclear charge (Z)

2. Valence principal quantum number(n)

3. Electron-electron interaction in the outer orbitals

4. None

Q. Assertion: ${\text{Mg}}^{2+}$and ${\text{Al}}^{3+}$ are isoelectronic but ionic radius ${\text{Al}}^{3+}$ is less than that of ${\text{Mg}}^{2+}$.
Reason: The effective nuclear charge on the outer-shell electrons in ${\text{Al}}^{3+}$ is more than that in ${\text{Mg}}^{2+}$.

1. Both assertion and reason are true. Reason is the correct explanation of assertion.
2. Both assertion and reason are true. Reason is not the correct explanation of assertion.
3. Assertion is true. Reason is false.
4. Assertion is false. Reason is true.

Q.

Which of the following is not isoelectronic series?

1. $C{l}^{-},P^{3-},Ar$

2. $N^{3-},Ne,M{g}^2$

3. $B^3,He,Li$

4. $N^{3-},S^{2-},C{l}^{-}$

Q.

Statement - I: $C{l}^{-}andC{a}^{2+}$ are isoelectronic species.
Statement - II: Isoelectronic species should have same charges.

1. Statement - I is true; Statement - II is true; Statement - II is correct explanation for Statement - I

2. Statement - I is true; Statement - II is true; Statement - II is NOT the correct explanation for Statement - I

3. Statement - I is true; Statement - II is false

4. Statement - I is false; Statement - II is true

Q.

Which one of the following sets of ions represents a collection of isoelectronic species?

1. N^3- , O^2- , F^- , S^2-

2. Li⁺ , Na⁺ , Mg²⁺ , Ca²⁺

3. K⁺ , CI^-, Ca²⁺ , Sc³⁺

4. Ba²⁺ , Sr²⁺ , K⁺, ca²⁺

Q. Which of the following species is isoelectronic with $C{O}_2$?

1. $N_3^{-}$
2. $(CNO{)}^{-}$
3. $(NCN{)}^{2-}$
4. All of these

Q. The ionic radii (in $\stackrel{\circ }{A}$) of $N^{3-},O^{2-},F^{-}$ are respectively:

1. 1.36, 1.40 and 1.71
2. 1.36, 1.71 and 1.40
3. 1.71, 1.40 and 1.36
4. 1.71, 1.36 and 1.40

Q. Which one of the following group of atoms or ions is not isoelectronic?

1. $He,H^{-},L{i}^{+}$
2. $N{a}^{+},M{g}^{2+},A{l}^{3+}$
3. $F^{-},O^{2-},N^{3-}$
4. $K^{+},C{a}^{2+},Ne$

Q. How many electrons are possible

1. 4p
2. 5p_z
3. n=3, l=2
4. n=4, l=2, s=+½

Q. Which of the following pairs of ions is isoelectronic and isostructural ?

1. $S{O}_3^{2-},N{O}_3^{-}$
2. $Cl{O}_3^{-},S{O}_3^{2-}$
3. $C{O}_3^{2-},N{O}_3^{-}$
4. $Cl{O}_3^{-},C{O}_3^{2-}$

Q. Which of the following sets represents the collection of isoelectronic species?

1. $N{a}^{+},M{g}^{2+},A{l}^{3+},C{l}^{-}$
2. $N{a}^{+},C{a}^{2+},S{c}^{3+},F^{-}$
3. $K^{+},C{l}^{-},C{a}^{2+},S{c}^{3+}$
4. $K^{+},C{a}^{2+},S{c}^{3+},F^{-}$

Q.

In the iso electronic species the ionic radii ($A^O$) of $N^{3-}$, $O^{-2}$, $F^{-}$ are respectively given by

1. 1.36, 1.40, 1.71

2. 1.36, 1.71, 1.40

3. 1.71, 1.40, 1.36

4. 1.71, 1.36, 1.40