Graphite in an example of-

(1) Ionic solid

(2) Covalent solid

(3) Vander waal's crystal

(4) Metallic crystal

Subtopic:  Introduction & Crystal System |
 95%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Select the correct statement (s)-

(a) The C.N. of cation occupying a tetrahedral hole is 4.

(b) The C.N. of cation occupying a octahedral hole is 6.

(c) In schottky defects, density of the lattice decreases,

(A) a,b

(B) b,c

(C) a,b,c

(D) a,c

Subtopic:  Voids, Radius Ratio & Coordination Number |
 80%
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Which arrangement of electrons leads to anti-ferromagnetism?
(1)  ↑↑↑↑
(2)  ↑↓↑↓
(3) Both (a) and (b)
(4) None of these

Subtopic:  Magnetic Behaviour of an Element/Compound |
 86%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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Among the following types of voids. which one is the largest void:-

(A) Triangular system
(B) Tetragonal system
(C) Monoclinic system
(D) Octahedral

Subtopic:  Introduction & Crystal System | Voids, Radius Ratio & Coordination Number | Magnetic Behaviour of an Element/Compound |
 77%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The ratio of cations to anion in a closed pack tetrahedral is:

(a) 0.714
(b) 0.225
(c) 0.02
(d) none of these

Subtopic:  Voids, Radius Ratio & Coordination Number |
 84%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The most efficient packing of similar spheres is obtained in 

1. the simple cubic system and the body centered cubic system

2. the simple cubic system and the hexagonal close packed system

3. the face centered cubic system and the hexagonal close packed system

4. the body centered cubic system and the face centered cubic system

Subtopic:  Density & Packing Fraction |
 79%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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Frenkel defect is noticed in:

(a) AgBr

(b) ZnS

(c) Agl

(d) all of these

Subtopic:  Imperfections in Solids & Semiconductors |
 91%
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

How many octahedral and tetrahedral holes are present per unit cell in a face centred cubic arrangement of atoms?

(1) 8,4

(2) 1.2

(3) 4.8

(4) 2.1

Subtopic:  Introduction & Crystal System |
 80%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Choose the correct matching sequence from the possibilities given

(a) Crystal defect  (i) AB AB AB. . . . type crystal
(b) hcp  (ii) Covalent crystal
(c) CsCl    (iii) Frenkel
(d) Diamond  (iv) Face centered in cube
(e) NaCl (v) Body centered in cube
 
(a) (b) (c) (d) (e)
(1) (iii) (i) (ii) (v) (iv)
(2) (iii) (i) (v) (ii) (iv)
(3) (iii) (v) (i) (ii) (iv)
(4) (v) (iii) (iv) (ii) (i)
Subtopic:  Imperfections in Solids & Semiconductors |
 84%
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NEET 2023 - Target Batch - Aryan Raj Singh
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An element (atomic mass = 100 g mole) having BCC structure has unit cell edge 400 Ao. The density of the element is (number of atom bcc(z)=2)

1. 2.144g/cm3
2. 5.2g/cm3
3. 7.289g/cm3
4. 10.376g/cm3

Subtopic:  Density & Packing Fraction |
 75%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints