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Quiz 2

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NCAT - Practice Test - Chemistry - Solids Quiz

Attempt 10 MCQs on NCAT - Practice Test - Chemistry - Solids | Quiz 2

11. What radius ratio gives cubic coordination (CN=8)?

0.732 - 1.0
0.414 - 0.732
0.225 - 0.414
> 1.0

12. How does ion charge affect the lattice stability?

Higher charges
Lower charges
Same charges
Neutral atoms

13. Which properties are characteristic of ionic crystals?

High melting points, brittle, conductive when molten
Low melting points, soft, non-conductive
Very hard, high melting, conductive in solid state
Soft, low melting, conductive

14. What are the typical properties of molecular crystals?

Low melting, soft, non-conductive
High melting, hard, conductive
Moderate melting, brittle
Very high melting, extremely hard

15. How does lattice energy compare between ionic and molecular crystals?

High lattice energy
Low lattice energy
Zero lattice energy
Variable

16. What is the regular repeating array of points in a crystal called?

Crystal lattice
Unit cell
Bravais lattice
Space lattice

17. What is the smallest repeating structural unit of a crystal?

Unit cell
Lattice point
Crystal system
Space group

18. How many Bravais lattices and crystal systems exist?

7 crystal systems, 14 Bravais lattices
14 crystal systems, 7 Bravais lattices
6 crystal systems, 10 Bravais lattices
4 crystal systems, 6 Bravais lattices

19. Which cubic unit cell has lattice points at corners and face centers?

Simple cubic
Body-centered cubic
Face-centered cubic
Base-centered cubic

20. What are the coordination numbers for SC, BCC, and FCC?

6, 8, 12
8, 6, 12
12, 8, 6
4, 8, 12

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