Silver crystallizes in a face centred cubic system, 0.408 nm along each edge. The density of silver is 10.6 g/cm3 and the atomic mass is 107.9 g/mol. Calculate Avogadro's number.

(1) 6.00×1023 atom/mol

(2) 9.31×1023 atom/mol

(3) 6.23×1023 atom/mol

(4) 9.61×1023atom/mol

Subtopic:  Density & Packing Fraction |
 59%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Fraction of total volume occupied by atoms in a simple cube is

(1) π2

(2) 3π8

(3) 2π6

(4) π6

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

A solid AB has the NaCl structure. If radius of cation A+ is 120 pm, calculate the maximum possible value of the radius of the anion B

(1) 240 pm

(2) 280 pm

(3) 270 pm

(4) 290 pm

Subtopic:  Voids, Radius Ratio & Coordination Number |
 55%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

CsBr has a (bcc) arrangement and its unit cell edge length is 400 pm. Calculate the interionic distance in CsBr.

(1) 346.4 pm

(2) 643 pm

(3) 66.31 pm

(4) 431.5 pm

Subtopic:  Introduction & Crystal System | Density & Packing Fraction |
 79%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The first order reflection (n = 1) from a crystal of the X-ray from a copper anode tube (λ=0.154nm) occurs at an angle of 16.3°. What is the distance between the set of planes causing the diffraction.

(1) 0.374nm

(2) 0.561nm

(3) 0.274nm 

(4) 0.395nm

Subtopic:  Introduction & Crystal System |
 54%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The diffraction of barium with X-radiation of wavelength 2.29Å gives a first – order reflection at 30°. What is the distance between the diffracted planes.

(1) 3.29 Å

(2) 4.39 Å

(3) 2.29 Å

(4) 6.29 Å

Subtopic:  Introduction & Crystal System |
 73%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

When an electron in an excited Mo atom falls from L to the K shell, an X-ray is emitted. These X-rays are diffracted at angle of 7.75o by planes with a separation of 2.64Å. What is the difference in energy between K-shell and L-shell in Mo assuming a first-order diffraction. (sin7.75o=0.1349)

(1) 36.88 ×1015J

(2) 27.88×1016J

(3) 63.88 ×1017J

(4) 64.88×1016J

Subtopic:  Introduction & Crystal System |
 66%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Which is the incorrect statement?

(1) Fe0.95O has non-stoichiometric metal deficiency defect

(2) Density decreases in case of crystals with Schottky's defect

(3) NaCI(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal

(4) Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal

Subtopic:  Imperfections in Solids & Semiconductors |
 69%
From NCERT
NEET - 2017
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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:  Introduction & Crystal System |
 64%
NEET - 2016
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Lithium has a bcc structure. Its density is 530 kg m-3 and its atomic mass is 6.94 gmol-1.

The edge length of a unit cell of lithium metal is -

(NA=6.02 x1023 mol-1)

1. 352 pm

2. 527 pm

3. 264 pm

4. 154 pm

 

Subtopic:  Density & Packing Fraction |
 53%
From NCERT
NEET - 2016
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh