The unit cell of a metallic element of atomic mass 10<sup>8</sup> and density 10.5 gm⁄cm<sup>2</sup>, is a cube with edge length of 409 pm. The structure of the crystal lattice is:

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74

Physical Chemistry MCQ with Answers

74) The unit cell of a metallic element of atomic mass 10⁸ and density 10.5 gm⁄cm², is a cube with edge length of 409 pm. The structure of the crystal lattice is:

fcc

bcc

hcp

None of these

Answer is:

fcc

Explanation:

ρ = (Z x M)⁄(N x a³)

Physical Chemistry MCQ with Answers

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75) Copper metal has a fcc structure with a unit cell length of 0.361 nm. Picturing copper ions in contact along the face diagonal, the apparent radius of the copper ion is:

0.128

1.42

3.22

4.22

Answer is:

0.128

Explanation:

For fcc, radius = √2a⁄4

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

MnO₂

VO₂

TiO₂

CrO₂

Answer is:

MnO₂

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.

Physical Chemistry MCQ with Answers

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74) The unit cell of a metallic element of atomic mass 108 and density 10.5 gm⁄cm2, is a cube with edge length of 409 pm. The structure of the crystal lattice is:

fcc

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

75) Copper metal has a fcc structure with a unit cell length of 0.361 nm. Picturing copper ions in contact along the face diagonal, the apparent radius of the copper ion is:

0.128

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

MnO2

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

Physical Chemistry MCQ with Answers

74) The unit cell of a metallic element of atomic mass 10⁸ and density 10.5 gm⁄cm², is a cube with edge length of 409 pm. The structure of the crystal lattice is:

MnO₂