# Which of the following sets contain only isoelectronic ions? (i) ZnX2+,CaX2+,GaX3+,AlX3+ (ii) KX+,CaX2+,ScX3+,ClX− (iii) PX3−,SX2−,ClX−,KX+ (iv) TiX4+,Ar,CrX3+,VX5+ - Chemistry

Short Note

Which of the following sets contain only isoelectronic ions?

(i) $\ce{Zn^{2+}, Ca^{2+}, Ga^{3+}, Al^{3+}}$

(ii) $\ce{K+ , Ca^{2+}, Sc^{3+}, Cl-}$

(iii) $\ce{P^{3-}, S^{2-}, Cl- , K+}$

(iv) $\ce{Ti^{4+}, Ar, Cr^{3+}, V^{5+}}$

#### Solution

(ii) $\ce{K+ , Ca^{2+}, Sc^{3+}, Cl-}$

(iii) $\ce{P^{3-}, S^{2-}, Cl- , K+}$

Explanation:

(a) $\ce{Zn^{2+}}$ (30 – 2 = 28), $\ce{Ca^{2+}}$ (20 – 2 = 18), $\ce{Ga^{3+}}$ (31 – 3 = 28), $\ce{Al^{3+}}$ (13 – 3 = 10) are not isoelectronic.

(b) $\ce{K+}$ (19 – 1 = 18), $\ce{Ca^{2+}}$ (20 – 2 = 18), $\ce{Sc^{3+}}$ (21 – 3 = 18), $\ce{Cl-}$ (17 + 1 = 18) are isoelectronic.

(c) $\ce{P^{3-}}$ (15 + 3 = 18), $\ce{S^{2-}}$ (16 + 2 = 18), $\ce{Cl-}$ (17 + 1 = 18), K+ (19 – 1 = 18) are isoelectronic.

(d) $\ce{Ti^{4+}}$ (22 – 4 = 18), $\ce{Ar}$ (18), $\ce{Cr^{3+}}$ (24 – 3 = 21), $\ce{V^{5+}}$ (23 – 5 = 18) are not isoelectronic.

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Chapter 3: Classification of Elements and Periodicity in Properties - Multiple Choice Questions (Type - I) [Page 31]

#### APPEARS IN

NCERT Exemplar Chemistry Class 11
Chapter 3 Classification of Elements and Periodicity in Properties
Multiple Choice Questions (Type - I) | Q 19 | Page 31

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