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OJEE Voids — practice questions

Explore 2 free Voids questions in OJEE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Voids questions and exercises with answers

Showing questions 1–2 of 2.

The ratio of **tetrahedral voids** to **atoms** in a close-packed structure (fcc or hcp) is:Read the answer and worked solution →The ratio of **octahedral voids** to **atoms** in a close-packed structure is:Read the answer and worked solution →

Worked practice questions

The ratio of **tetrahedral voids** to **atoms** in a close-packed structure (fcc or hcp) is:

  1. 1 : 1
  2. 2 : 1
  3. 1 : 2
  4. 3 : 1
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Correct answer: B. 2 : 1

In any close-packed structure (fcc/hcp), per atom in the lattice there are 2 tetrahedral voids and 1 octahedral void. Used in classifying ionic compounds (NaCl fcc lattice, etc.).

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The ratio of **octahedral voids** to **atoms** in a close-packed structure is:

  1. 1 : 1
  2. 2 : 1
  3. 1 : 2
  4. 3 : 1
Show answer and solution

Correct answer: A. 1 : 1

**Per atom in fcc/hcp:** 1 octahedral void. NaCl structure exploits this — Cl⁻ in fcc lattice, Na⁺ in all octahedral voids → 1:1 stoichiometry, CN = 6.

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