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Physical Chemistry
64

Physical Chemistry MCQ with Answers

64) Schottky defect generally appears in:

KCl

NaCl

CsCl

All of these

Answer is:

All of these

Explanation:

Schottky defect generally appears in
* KCl
* NaCl
* CsCl

Physical Chemistry MCQ with Answers

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65) Anion A²⁻ forms cubic close packing and cation B²⁺ occupies 25% octahedral holes, while cation B³⁺ occupies equal number of tetrahedral and octahedral holes. If number of octahedral holes occupied by B²⁺ and B³⁺ are equal, then formula of the molecule is:

B₃A₄

A₃B₄

AB₂

AB₃

Answer is:

B₃A₄

66) An ionic solid M₂X₃ has a cubic unit cell. Which of the following arrangements of the ions is consistent with the stoichiometry of the compound?

M³⁺ ions occupy the corners and X²⁻ ions center of the faces

X²⁻ ions occupy the corners and M³⁺ ions center of the faces

X²⁻ ions occupy the corners and M³⁺ ions the body center

M³⁺ ions occupy the corners and the body center X²⁻ ions center of the faces

Answer is:

M³⁺ ions occupy the corners and the body center X²⁻ ions center of the faces

67) AB crystallizes in a body centered cubic lattice with edge length, a = 387 pm. The distance between two oppositely charged ions in the lattice is:

335 pm

250 pm

200 pm

300 pm

Answer is:

335 pm

Explanation:

For a bcc lattice, 2(r⁺ + r⁻) = √3a.

68) Fraction of total volume occupied by atoms in a simple cube is:

π⁄2

√3π⁄2

√2π⁄6

π⁄6

Answer is:

π⁄6

Explanation:

Packing fraction = Volume occupied by 1 atom ⁄ Volume of unit cell

Physical Chemistry MCQ with Answers

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64) Schottky defect generally appears in:

All of these

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

65) Anion A2− forms cubic close packing and cation B2+ occupies 25% octahedral holes, while cation B3+ occupies equal number of tetrahedral and octahedral holes. If number of octahedral holes occupied by B2+ and B3+ are equal, then formula of the molecule is:

B3A4

66) An ionic solid M2X3 has a cubic unit cell. Which of the following arrangements of the ions is consistent with the stoichiometry of the compound?

M3+ ions occupy the corners and the body center X2− ions center of the faces

67) AB crystallizes in a body centered cubic lattice with edge length, a = 387 pm. The distance between two oppositely charged ions in the lattice is:

335 pm

68) Fraction of total volume occupied by atoms in a simple cube is:

π⁄6

Physical Chemistry MCQ with Answers

65) Anion A²⁻ forms cubic close packing and cation B²⁺ occupies 25% octahedral holes, while cation B³⁺ occupies equal number of tetrahedral and octahedral holes. If number of octahedral holes occupied by B²⁺ and B³⁺ are equal, then formula of the molecule is:

B₃A₄

66) An ionic solid M₂X₃ has a cubic unit cell. Which of the following arrangements of the ions is consistent with the stoichiometry of the compound?

M³⁺ ions occupy the corners and the body center X²⁻ ions center of the faces