Question

CHOOSE :-

1) Solid CO2 is an example of

(a) covalent solid
(b) Metallic solid
(c) Molecular solid
(d) Ionic solid

2) The crystal with a metal deficiency defect is

(a) NaCI
(b) FeO
(c) ZnO
(d) KCI

3) The vacant space in BCC lattice unit

(a) 48%
(b) 23%
(c) 32%
(d) 26%








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Answer 1

Answer:

1 c) Molecular solid (crystals)

2) b) FeO

The defect that arises due to the missing of a cation from its lattice site and presence of the cation with higher charge in the adjacent site is called metal deficiency defect. Hence, the metals showing variable valency like transition metal show this defect, e.g., FeO

3) (c)32%

Packing fraction of BCC unit cell is 68%. Therefore, the vacant space in BCC unit cell is 32%.

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Answer 2

Answer:

1 ans (c)

2 ans (b)

3 ans (c)