Chemistry Questions and Answers – Solid State – Close Packed Structures

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This set of Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Solid State – Close Packed Structures”.

1. In ______ constituent particles are closely packed leaving the least amount of vacant spaces.
a) plasma
b) liquids
c) solids
d) gases
View Answer

Answer: c
Explanation: In solids, the constituent particles tend to be closely packed due to strong forces between them. Hence, solids are stable and have a definite shape.
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2. What is the coordination number for one-dimensional close packing?
a) 2
b) 1
c) 4
d) 6
View Answer

Answer: a
Explanation: In one-dimensional close packing, the constituent particles are assumed to be arranged in a row. Thus, each constituent particle comes in contact with 2 of its neighbors and thereby giving the coordination number 2.

3. In how many ways, can the two-dimensional close packed structure be generated?
a) 3
b) 2
c) 1
d) 5
View Answer

Answer: b
Explanation: Two-dimensional close packed structure can be generated using the one-dimensional close packed structures. This can be done in 2 ways:
• By placing one row of one-dimensional structure below another in such a way that the spheres are one below the another.
• By placing one row of one-dimensional structure below another such that spheres of second row fit in the depressions of the first row.
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4. What is the coordination number for a two-dimensional square close packed structure?
a) 8
b) 4
c) 6
d) 2
View Answer

Answer: b
Explanation: In a two-dimensional square close packed structure, each sphere is in contact with 4 of its adjacent spheres. Hence, it has coordination number 4.

5. What is the coordination number for a two-dimensional hexagonal close packed structure?
a) 4
b) 8
c) 12
d) 6
View Answer

Answer: d
Explanation: In a two-dimensional hexagonal close packed structure, each sphere is in direct contact with 6 of its adjacent spheres. Hence, it has coordination number 6.
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6. Voids in two-dimensional hexagonal close packed structure are ___________ in shape.
a) circular
b) rectangular
c) triangular
d) hexagonal
View Answer

Answer: c
Explanation: Two-dimensional hexagonal close packed structure are formed when one row of a one-dimensional structure is placed below another in such a way that spheres of second row fit in the depressions of the first row and thereby creating triangular voids between them.

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To practice all areas of Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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