The correct statement(s) among the above is - a. The coordination number of a cation occupying a tetrahedral hole is 4. b. The coordination number of a cation occupying an octahedral hole is 6. c. In Schottky defect, the density of the lattice decreases. 1. a, b                                          2. b, c 3. a, b, c                                      4. a, c

Subtopic:  Introduction & Crystal System |
75%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The unit cell dimensions of a cubic lattice (edges a, b, c and the angles between them, α, β, γ) are :

1. a = b = c,

2. a = b c,

3. a = b = c,

4. a c,

Subtopic:  Introduction & Crystal System |
94%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In a cubic unit cell, atom A is present at each corner, atom B at each face centre and atom C at the body centre. The simplest formula of the solid is :

1. ${\mathrm{AB}}_{2}\mathrm{C}$

2. ${\mathrm{A}}_{2}\mathrm{BC}$

3. ${\mathrm{AB}}_{3}\mathrm{C}$

4. ${\mathrm{ABC}}_{3}$

Subtopic:  Voids, Radius Ratio & Coordination Number |
85%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If Xenon crystallizes in face center cubic lattice and the edge of the unit cell is 620 pm, then the radius of the Xenon atom is-

1. 219.20 pm

2. 438.5 pm

3. 265.5 pm

4. 536.94 pm

Subtopic:  Voids, Radius Ratio & Coordination Number |
79%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Iodine crystals are classified as-

1. Metallic solids.

2. Ionic solids.

3. Molecular solids .

4. Covalent solids.

Subtopic:  Introduction & Crystal System |
67%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca2+) and fluoride ion (F-) are:

1. 4 and 2

2. 6 and 6

3. 8 and 4

4. 4 and 8

Subtopic:  Voids, Radius Ratio & Coordination Number |
71%
NEET - 2016
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

The incorrect statement among the following is -

 1 Density decreases in case of crystals with Schottky's defect. 2 NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal. 3 Frenkel defect is favoured in those ionic compounds in which sizes of cations and anions have large difference. 4 $$Fe_{0.98}O$$ has non stoichiometric metal excess defect.
Subtopic:  Imperfections in Solids & Semiconductors |
53%
From NCERT
NEET - 2017
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Iron exhibits bcc structure at room temperature. Above 900 °C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900 °C is:

(Molar mass and atomic radii of iron remain constant with temperature)

1. $\frac{\sqrt{3}}{\sqrt{2}}$

2. $\frac{4\sqrt{3}}{3\sqrt{2}}$

3. $\frac{3\sqrt{3}}{4\sqrt{2}}$

4. $\frac{1}{2}$

Subtopic:  Density & Packing Fraction |
57%
From NCERT
NEET - 2018
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Iron has a body centred cubic unit cell with the cell dimension of 286.65 pm. Density of iron is 7.87 g cm-3. The value of  Avogadro's number based on this data will be -

(Atomic mass of Fe = 56.0 u)

1. 6.04 x 1023 mol-1

2. 12.08 x 1024 mol-1

3. 6 x 1022 mol-1

4. 6 x 10-23 mol-1

Subtopic:  Density & Packing Fraction |
74%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Lithium has a bcc structure. Its density is 530 kg m-3 and its atomic mass is 6.94 g mol-1. The edge length of a unit cell of lithium metal is:
(NA= 6.02 X 1023 mol-1)
1. 352 pm
2. 527 pm
3. 264 pm
4. 154 pm
Subtopic:  Density & Packing Fraction |
57%
From NCERT
NEET - 2016
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints