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An element with density 10 g cm−3 forms a cubic unit cell with edge length of 3 × 10−8 cm. What is the nature of the cubic unit cell if the atomic mass of the element is 81 g mol−1?
Concept: Calculations Involving Unit Cell Dimensions
How will you distinguish between the following pair of terms?
Tetrahedral and octahedral voids
Concept: Close Packed Structures - Formula of a Compound and Number of Voids Filled
How will you distinguish between the following pair of terms?
Crystal lattice and unit cell
Concept: Crystal Lattices and Unit Cells
Which stoichiometric defect does not change the density of the crystal?
Concept: Imperfections in Solids - Introduction
Which stoichiometric defect decreases the density of the crystal?
Concept: Imperfections in Solids - Introduction
Explain ionic solids are hard and brittle.
Concept: Classification of Crystalline Solids
An ionic compound crystallises in FCC type structure with ‘A’ ions at the centre of each face and ‘B’ ions occupying corners of the cube. The formula of compound is _______.
Concept: Classification of Crystalline Solids
An ionic crystal lattice has limiting value of radius ratio as 0.414 to 0.732; the co-ordination number of its cation is _______.
(A) 6
(B) 4
(C) 3
(D) 12
Concept: Crystal Lattices and Unit Cells
Classify the following solids into different types:
a. Ammonium phosphate
b. Brass
c. S8 molecule
d. Diamond
Concept: Classification of Crystalline Solids
A metal crystallises into two cubic faces namely face centered (FCC) and body centered (BCC), whose unit cell edge lengths are 3.5 Å and 3.0 Å respectively. Find the ratio of the densities of FCC and BCC.
Concept: Calculations Involving Unit Cell Dimensions
Explain with reason sign conventions of ΔS in the following reaction
N2(g) + 3H2(g) → 2NH3(g)
Concept: Number of Atoms in a Unit Cell
Explain with reason sign conventions of ΔS in the following reaction
CO2(g) → CO2(g)
Concept: Number of Atoms in a Unit Cell
Schottky defects are observed in which solid among the following?
(a) Brass
(b) Cesium Chloride
(c) Zinc sulphide
(d) Stainless steel
Concept: Imperfections in Solids - Introduction
A face centred cube (FCC) consists of how many atoms? Explain
Concept: Number of Atoms in a Unit Cell
Which of the following parameters are correct for triclinic lattice?
(A) α = β = γ = 90° and a = b = c
(B) α ≠ β ≠ γ = 90° and a ≠ b ≠ c
(C) α = γ = 90°, β ≠ 90° and a ≠ b ≠ c
(D) α ≠ β ≠ γ ≠ 90° and a ≠ b ≠ c
Concept: Crystal Lattices and Unit Cells
Calculate the number of atoms present in 2 gram of crystal which has face-centred cubic
(FCC) crystal lattice having edge length of 100 pm and density 10 gcm−3
Concept: Crystal Lattices and Unit Cells
What are Frenkel defect
Concept: Imperfections in Solids - Introduction
A pure semiconductor is ________.
(a) an extrinsic semiconductor
(b) an intrinsic semiconductor
(c) p-type semiconductor
(d) n-type semiconductor
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors
An ionic crystal lattice has `r^+/r` radius ratio of 0.320, its coordination number is __
(a) 3
(b) 4
(c) 6
(d) 8
Concept: Crystal Lattices and Unit Cells
The density of iron crystal is 8.54-gram cm–3. If the edge length of the unit cell is 2.8 A° and atomic mass is 56 gram mol–1, find the number of atoms in the unit cell. (Given: Avogadro's number = 6.022x1023,1A° = 1x10-8 cm)
Concept: Packing of Particles in Crystal Lattice
