Chapter Exam

Chapter 6: Solid State — Online MCQ Test

Q: Which of the following is an example of a crystalline solid?

Answer: B. Quartz — Quartz is a crystalline solid with a regular and repeating arrangement of particles. Glass is amorphous, not crystalline.

Q: The number of nearest neighbouring atoms in a body-centered cubic (bcc) unit cell is:

Answer: B. 8 — In a bcc structure, each atom has 8 nearest neighbours. This is called the coordination number.

Q: Which of the following statements about hexagonal close packing (hcp) is correct?

Answer: C. Packing efficiency is 74% — Both hcp and ccp structures have a packing efficiency of 74%, which is the maximum for close packing.

Q: Which of the following statements is NOT correct regarding a simple cubic lattice?

Answer: D. There are 2 atoms per unit cell — A simple cubic unit cell has only 1 atom per unit cell, not 2. The other statements are correct for a simple cubic structure.

Q: A cubic solid has a density of 10.0 g cm⁻³, molar mass 120 g mol⁻¹ and edge length 400 pm. How many formula units are present per unit cell? [N_A = 6.02 × 10²³ mol⁻¹]

Answer: B. 2 — Using d = ZM / (N_A a^3), the given values give Z approximately 2. Therefore, the unit cell contains 2 formula units.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 6: Solid State with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: Exploring crystalline solids this chapter covers unit cells crystal lattices packing efficiency and density calculations. Students examine Bragg law point defects like Schottky and.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 6: Solid State — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 6: Solid State, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is an example of a crystalline solid?

A. Glass
B. Quartz ✓
C. Rubber
D. Plastic

Answer: B. Quartz
Quartz is a crystalline solid with a regular and repeating arrangement of particles. Glass is amorphous, not crystalline.

The number of nearest neighbouring atoms in a body-centered cubic (bcc) unit cell is:

A. 6
B. 8 ✓
C. 12
D. 4

Answer: B. 8
In a bcc structure, each atom has 8 nearest neighbours. This is called the coordination number.

Which of the following statements about hexagonal close packing (hcp) is correct?

A. Packing efficiency is 52%
B. Coordination number is 8
C. Packing efficiency is 74% ✓
D. It has one atom per unit cell

Answer: C. Packing efficiency is 74%
Both hcp and ccp structures have a packing efficiency of 74%, which is the maximum for close packing.

Which of the following statements is NOT correct regarding a simple cubic lattice?

A. Coordination number is 6
B. Packing efficiency is about 52.4%
C. Atoms touch each other along the edge
D. There are 2 atoms per unit cell ✓

Answer: D. There are 2 atoms per unit cell
A simple cubic unit cell has only 1 atom per unit cell, not 2. The other statements are correct for a simple cubic structure.

A cubic solid has a density of 10.0 g cm⁻³, molar mass 120 g mol⁻¹ and edge length 400 pm. How many formula units are present per unit cell? [N_A = 6.02 × 10²³ mol⁻¹]