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To prepare n-type semiconductor the impurity to be added to silicon should have the following number of valence electrons:
(a) 2
(b) 3
(c) 4
(d) 5
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors
When a hole is produced in P-type semiconductor, there is _______.
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors
Give an example each of a molecular solid and an ionic solid.
Concept: Classification of Crystalline Solids
Give an example each of a molecular solid and an ionic solid.
Concept: Classification of Crystalline Solids
An element crystallises in a b.c.c lattice with cell edge of 500 pm. The density of the element is 7.5g cm-3. How many atoms are present in 300 g of the element?
Concept: Number of Atoms in a Unit Cell
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
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 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
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
