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GS
GS Set-1
Chemistry
Physical Chemistry
79

Physical Chemistry MCQ with Answers

79) In octahedral holes (voids):

A bi−triangular void is surrounded by 6 spheres

A bi−triangular void is surrounded by 4 spheres

A bi−triangular void is surrounded by 8 spheres

A simple triangular void is surrounded by 4 spheres

Answer is:

A bi−triangular void is surrounded by 6 spheres

Physical Chemistry MCQ with Answers

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Related Physical Chemistry MCQ with Answers

80) The edge of unit cell of fcc Xe crystal is 620 pm. The radius of Xe atom is:

189.37 pm

209.87 pm

219.25 pm

235.16 pm

Answer is:

219.25 pm

Explanation:

r = a⁄2√2

81) Which of the following statements is not true about NaCl structure?

Cl⁻ ions are in fcc arrangement

Na⁺ ions have coordination number 4

Cl⁻ ions have coordination number 6

Each cell contains 4 NaCl molecules

Answer is:

Na⁺ ions have coordination number 4

Explanation:

In NaCl crystal, Na⁺ ions have coordination number 6.

82) Most crystals show good cleavage because their atoms, ions or molecules are:

Weakly bonded together

Strongly bonded together

Spherically symmetrical

Arranged in planes

Answer is:

Arranged in planes

83) In a solid lattice, the cation has left a lattice site and is located at an interstitial position. The lattice defect is:

Frenkel defect

Schottky defect

Interstitial defect

Valency defect

Answer is:

Frenkel defect

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