chemistry : class12 Types of Ionic Structures : Ionic solids : Solid State MCQ Questions and Answers
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Types of Ionic Structures
MCQ questions and answers.
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MCQ Questions
1. What is the coordination number of each ion in the rock-salt structure of sodium chloride (NaCl)?
A.
4
B.
6
C.
8
D.
12
Correct Answer:
6
Explanation:
In the rock-salt structure, each Na+ ion is surrounded by six Cl− ions, and each Cl− ion is surrounded by six Na+ ions. Therefore, the coordination number is 6:6.
2. Which type of ionic structure is present in caesium chloride (CsCl)?
A.
Rock-salt structure
B.
Body-centred cubic-type structure
C.
Zinc blende structure
D.
Fluorite structure
Correct Answer:
Body-centred cubic-type structure
Explanation:
In the CsCl structure, one ion is at the body centre of a simple cubic arrangement of the other ions. Each ion has a coordination number of 8.
3. What is the coordination number of each ion in the caesium chloride (CsCl) structure?
A.
2
B.
4
C.
6
D.
8
Correct Answer:
8
Explanation:
In the CsCl structure, each Cs+ ion is surrounded by eight Cl− ions, and each Cl− ion is surrounded by eight Cs+ ions. Hence, the coordination number is 8:8.
4. Which ionic solid commonly has a zinc blende structure?
A.
NaCl
B.
CsCl
C.
ZnS
D.
CaF2
Correct Answer:
ZnS
Explanation:
Zinc sulfide, ZnS, can crystallise in the zinc blende structure. In this structure, each Zn2+ ion is surrounded by four S2− ions.
5. What is the coordination number of each ion in the zinc blende structure?
A.
4
B.
6
C.
8
D.
12
Correct Answer:
4
Explanation:
The zinc blende structure has tetrahedral coordination. Each cation is surrounded by four anions, and each anion is surrounded by four cations.
6. In the rock-salt structure, which arrangement is formed by the anions?
A.
Simple cubic arrangement
B.
Body-centred cubic arrangement
C.
Face-centred cubic arrangement
D.
Hexagonal arrangement only
Correct Answer:
Face-centred cubic arrangement
Explanation:
In the rock-salt structure, the anions form a face-centred cubic lattice, while the cations occupy all the octahedral holes.
7. In the CsCl structure, where is the second type of ion located relative to the cubic arrangement of the first type of ion?
A.
At the centre of the cube
B.
Only at the face centres
C.
Only at the edge centres
D.
In tetrahedral holes
Correct Answer:
At the centre of the cube
Explanation:
The CsCl structure consists of one type of ion at the corners of a cube and the other type at the body centre, giving each ion eight nearest neighbours.
8. Which structure has tetrahedral coordination of ions?
A.
Rock-salt structure
B.
Caesium chloride structure
C.
Zinc blende structure
D.
Body-centred ionic structure with coordination number 8
Correct Answer:
Zinc blende structure
Explanation:
The zinc blende structure has tetrahedral coordination, in which each ion is surrounded by four oppositely charged ions.
9. What is the coordination number of Ca2+ ions in the fluorite structure of calcium fluoride (CaF2)?
A.
4
B.
6
C.
8
D.
12
Correct Answer:
8
Explanation:
In the fluorite structure, each Ca2+ ion is surrounded by eight F− ions. Thus, the coordination number of calcium ions is 8.
10. What is the coordination number of F− ions in the fluorite structure of calcium fluoride (CaF2)?
A.
2
B.
4
C.
6
D.
8
Correct Answer:
4
Explanation:
In the fluorite structure, each F− ion occupies a tetrahedral hole and is surrounded by four Ca2+ ions. Therefore, the coordination number of fluoride ions is 4.
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