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GS Set-1
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Physical Chemistry
76

Physical Chemistry MCQ with Answers

76) Which one of the following metal oxides is antiferromagnetic in nature?

MnO₂

VO₂

TiO₂

CrO₂

Answer is:

MnO₂

Physical Chemistry MCQ with Answers

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77) A fcc unit cell of aluminium contains the equivalent of how many atoms?

Answer is:

4

78) For an ionic crystal of the general formula AX and coordination number 6, the value of radius will be:

In between 0.732 and 0.414

In between 0.414 and 0.225

Less than 0.225

Greater than 0.732

Answer is:

In between 0.732 and 0.414

Explanation:

The structure arrangement of coordination number 6 is octahedral and its radius ratio is 0.414 − 0.732.

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

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

Physical Chemistry MCQ with Answers

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76) Which one of the following metal oxides is antiferromagnetic in nature?

MnO2

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

77) A fcc unit cell of aluminium contains the equivalent of how many atoms?

4

78) For an ionic crystal of the general formula AX and coordination number 6, the value of radius will be:

In between 0.732 and 0.414

79) In octahedral holes (voids):

A bi−triangular void is surrounded by 6 spheres

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

219.25 pm

Physical Chemistry MCQ with Answers

MnO₂