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GS
GS Set-1
Chemistry
Physical Chemistry
81

Physical Chemistry MCQ with Answers

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.

Physical Chemistry MCQ with Answers

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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

84) The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is:

Answer is:

8

Explanation:

When radius ratio is between 0.732 and 1, then coordination number is 8 and structural arrangement is bcc.

85) Na and Mg crystallize in bcc and fcc type crystals respectively. The number of atoms of Na and Mg present in the unit cell of their respective crystal is:

2 and 4

4 and 2

9 and 14

14 and 9

Answer is:

2 and 4

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

Na+ ions have coordination number 4

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

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

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

84) The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is:

8

85) Na and Mg crystallize in bcc and fcc type crystals respectively. The number of atoms of Na and Mg present in the unit cell of their respective crystal is:

2 and 4

Physical Chemistry MCQ with Answers

Na⁺ ions have coordination number 4