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Solid State WBCHSE Class 12 MCQ & Practice Questions

Practice Solid State MCQs for WBCHSE Class 12 Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Solid State Revision Guide for WBCHSE Class 12 Chemistry

Solid State is part of WBCHSE Class 12 Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for Solid State, then test recall with mixed MCQs.

What to practise in Solid State

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Solid State before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for WBCHSE Class 12 Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 20 Solid State MCQs with Answers

These public questions are selected from the exact Solid State chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

1. A crystalline solid is characterized by:

  • A. No definite geometry
  • B. No periodicity
  • C. Long-range order
  • D. Only short-range order
Answer: C
Explanation: Crystalline solids possess long-range periodic order.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

2. Effective atoms in a simple cubic unit cell are:

  • A. 8
  • B. 1
  • C. 2
  • D. 4
Answer: B
Explanation: Eight corner atoms contribute 8×1/8=1.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

3. Effective atoms in a BCC unit cell are:

  • A. 2
  • B. 1
  • C. 4
  • D. 6
Answer: A
Explanation: Corners contribute 1 and body centre contributes 1.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

4. Effective atoms in an FCC unit cell are:

  • A. 2
  • B. 1
  • C. 8
  • D. 4
Answer: D
Explanation: Corners contribute 1 and six faces contribute 3.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

5. Coordination number of simple cubic is:

  • A. 12
  • B. 4
  • C. 6
  • D. 8
Answer: C
Explanation: Each lattice point has six nearest neighbours.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

6. Coordination number of BCC is:

  • A. 4
  • B. 8
  • C. 6
  • D. 12
Answer: B
Explanation: A BCC lattice point has eight nearest neighbours.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

7. Coordination number of FCC/CCP is:

  • A. 12
  • B. 8
  • C. 6
  • D. 4
Answer: A
Explanation: Close-packed FCC has coordination number 12.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

8. Packing efficiency of BCC is closest to:

  • A. 52%
  • B. 74%
  • C. 100%
  • D. 68%
Answer: D
Explanation: BCC occupies about 68% of space.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

9. Packing efficiency of FCC is closest to:

  • A. 52%
  • B. 60%
  • C. 74%
  • D. 68%
Answer: C
Explanation: FCC/CCP is close packed at about 74%.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

10. For simple cubic, the edge-radius relation is:

  • A. a=4r
  • B. a=2r
  • C. a=4r/√3
  • D. a=2√2r
Answer: B
Explanation: Atoms touch along the edge.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

11. For BCC, the correct relation is:

  • A. √3a=4r
  • B. a=2r
  • C. √2a=4r
  • D. a=4r
Answer: A
Explanation: Atoms touch along the body diagonal.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

12. For FCC, the correct relation is:

  • A. √3a=4r
  • B. a=2r
  • C. a=4r
  • D. √2a=4r
Answer: D
Explanation: Atoms touch along a face diagonal.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

13. Number of tetrahedral voids for N close-packed spheres is:

  • A. N/2
  • B. 4N
  • C. 2N
  • D. N
Answer: C
Explanation: There are two tetrahedral holes per close-packed sphere.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

14. Number of octahedral voids for N close-packed spheres is:

  • A. 4N
  • B. N
  • C. 2N
  • D. N/2
Answer: B
Explanation: There is one octahedral hole per close-packed sphere.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

15. Coordination number in NaCl structure is:

  • A. 6:6
  • B. 8:8
  • C. 4:4
  • D. 12:12
Answer: A
Explanation: NaCl has octahedral 6:6 coordination.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

16. Coordination number in CsCl structure is:

  • A. 6:6
  • B. 4:4
  • C. 12:12
  • D. 8:8
Answer: D
Explanation: CsCl has cubic 8:8 coordination.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

17. A Schottky defect consists of:

  • A. Only trapped electrons
  • B. Only extra cations
  • C. Paired cation and anion vacancies
  • D. A vacancy-interstitial pair
Answer: C
Explanation: Equal cation and anion vacancies maintain neutrality.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

18. Schottky defect generally:

  • A. Destroys crystallinity
  • B. Lowers density
  • C. Raises density
  • D. Leaves density unchanged
Answer: B
Explanation: Missing ions reduce mass of the crystal.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

19. A Frenkel defect consists of:

  • A. A vacancy and an interstitial ion
  • B. Equal missing cations/anions
  • C. Only anion vacancies
  • D. Only electrons
Answer: A
Explanation: An ion leaves its lattice site for an interstitial position.

WBCHSE Class 12 Chemistry · Solid State · Very Hard

20. Frenkel defect generally:

  • A. Always lowers density
  • B. Always raises density
  • C. Makes density zero
  • D. Leaves density nearly unchanged
Answer: D
Explanation: No ion leaves the crystal.

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Solid State Practice Tests

Solid State Frequently Asked Questions

How should I prepare Solid State for WBCHSE Class 12 Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

How can ChemNexa help with Solid State practice?

This page provides public sample questions and links to published ChemNexa tests so you can combine quick revision with structured practice.

What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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