Silver metal crystallises in a cubic closest – packed arrangement with the edge of the unit cell having a length a = 407 pm. What is the radius of silver atom.

(1) 143.9 pm

(2) 15.6 pm

(3) 11.59 pm

(4) 13.61 pm

Subtopic:  Introduction & Crystal System | Density & Packing Fraction |
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From the fact that the length of the side of a unit cell of lithium is 351 pm. Calculate its

atomic radius. Lithium forms body-centered cubic crystals.

(1) 152.69 pm

(2) 62.71 pm

(3) 151.98 pm

(4) 54.61 pm

Subtopic:  Introduction & Crystal System |
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Atomic radius of silver is 144.5 pm. The unit cell of silver is a face centred cube. Calculate the density of silver.

(1) 10.50 g/cm3

(2) 16.50 g/cm3

(3) 12.30 g/cm3

(4) 15.50 g/cm3

Subtopic:  Density & Packing Fraction |
 55%
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A metallic element exists as a cubic lattice. Each edge of the unit cell is 2.88 Å. The density of the metal is 7.20 g cm–3.  The number of unit cells, that will be present in 100 gm of the metal is: 

1. 5.82 × 1023

2. 16.33 × 1023

3. 7.49 × 1024

4. 6.9 × 1024

Subtopic:  Density & Packing Fraction |
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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 |
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Fraction of total volume occupied by atoms in a simple cube is

(1) π2

(2) 3π8

(3) 2π6

(4) π6

Subtopic:  Density & Packing Fraction |
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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 |
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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 |
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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 |
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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 |
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