Chapter Exam

Unit 1: Solid State — Online MCQ Test

Q: Which of the following is an amorphous solid?

Answer: C. Glass — Glass does not have a long-range ordered arrangement of particles, so it is an amorphous solid.

Q: The number of atoms present per unit cell in a body-centered cubic (BCC) lattice is:

Answer: B. 2 — A BCC unit cell has 8 corner atoms contributing 1 atom in total and 1 atom at the body center, making 2 atoms per unit cell.

Q: How many atoms are present in one face-centered cubic (FCC) unit cell?

Answer: C. 4 — An FCC unit cell has 8 corner atoms and 6 face-centered atoms, giving a total of 4 atoms per unit cell.

Q: Which of the following is NOT a characteristic of a crystalline solid?

Answer: D. Isotropic nature — Crystalline solids are anisotropic, not isotropic, because their properties vary with direction.

Q: Which statement correctly compares packing efficiencies and coordination numbers of common cubic structures?

Answer: B. SC: 52%, CN 6; BCC: 68%, CN 8; FCC: 74%, CN 12 — Simple cubic has the lowest packing efficiency and coordination number, while FCC has the highest among the three common cubic structures.

CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 1: Solid State with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY. This chapter covers: This chapter covers classification of solids crystal lattices unit cells packing efficiency radius ratio rules density calculations Bragg Law and point defects in solids.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 1: Solid State — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY — Unit 1: Solid State, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is an amorphous solid?

A. Sodium chloride
B. Quartz
C. Glass ✓
D. Diamond

Answer: C. Glass
Glass does not have a long-range ordered arrangement of particles, so it is an amorphous solid.

The number of atoms present per unit cell in a body-centered cubic (BCC) lattice is:

A. 1
B. 2 ✓
C. 4
D. 8

Answer: B. 2
A BCC unit cell has 8 corner atoms contributing 1 atom in total and 1 atom at the body center, making 2 atoms per unit cell.

How many atoms are present in one face-centered cubic (FCC) unit cell?

A. 2
B. 3
C. 4 ✓
D. 6

Answer: C. 4
An FCC unit cell has 8 corner atoms and 6 face-centered atoms, giving a total of 4 atoms per unit cell.

Which of the following is NOT a characteristic of a crystalline solid?

A. Definite geometrical shape
B. Sharp melting point
C. Long-range order
D. Isotropic nature ✓

Answer: D. Isotropic nature
Crystalline solids are anisotropic, not isotropic, because their properties vary with direction.

Which statement correctly compares packing efficiencies and coordination numbers of common cubic structures?

A. SC: 74%, CN 12; BCC: 68%, CN 8; FCC: 52%, CN 6
B. SC: 52%, CN 6; BCC: 68%, CN 8; FCC: 74%, CN 12 ✓
C. SC: 68%, CN 8; BCC: 52%, CN 6; FCC: 74%, CN 12
D. SC: 74%, CN 12; BCC: 52%, CN 6; FCC: 68%, CN 8

Answer: B. SC: 52%, CN 6; BCC: 68%, CN 8; FCC: 74%, CN 12
Simple cubic has the lowest packing efficiency and coordination number, while FCC has the highest among the three common cubic structures.