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Name the γ-isomer of BHC.
Concept: Principles of Green Chemistry
Write any three advantages of nanoparticles and nanotechnology.
Concept: Nanoparticles and Nanotechnology
Explain any two chemical methods of food preservation.
Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
Iron (z=26) is highly ferromagnetic. Explain.
Concept: Properties of Solids: Magnetic Properties
Silver crystallises in FCC structure. If density of silver is 10.51 gcm-3, calculate the volume of unit cell. [Atomic mass of slive (Ag) = 108 gm-1]
Concept: Calculations Involving Unit Cell Dimensions
p - type semi-conductors are made by mixing silicon with impurities of ______.
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors
Explain impurity defect in stainless steel with diagram
Concept: Imperfections in Solids - Introduction
Niobium crystallises as body centred cube (BCC) and has density of 8.55 Kg / dm-3 . Calculate the attomic radius of niobium.
(Given : Atomic mass of niobium = 93).
Concept: Calculations Involving Unit Cell Dimensions
In a semiconductor, acceptor impurity is.................................
- antimony
- indium
- phosphorous
- arsenic
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors
The relation a ≠ b ≠ c and α ≠ β ≠ γ represents which crystal system?
(A) Orthorhombic
(B) Tetragonal
(C) Triclinic
(D) Monoclinic
Concept: Amorphous and Crystalline Solids
What is the hybridisation of carbon atom in diamond and graphite?
Concept: Amorphous and Crystalline Solids
The major binding force in diamond is_______________ .
(a) Covalent bond
(b) Ionic bond
(c) Metallic bond
(d) Co-ordinate covalent bond
Concept: Classification of Crystalline Solids
Describe triclinic crystal lattice with the help of a diagram.
Concept: Crystal Lattices and Unit Cells
A unit cell of iron crystal has edge length 288 pm and density 7.86 g.cm-3. Find the number of atoms per unit cell and type of the crystal lattice.
Given : Molar mass of iron = 56 g.mol-1; Avogadro's number NA = 6.022 x 1023.
Concept: Number of Atoms in a Unit Cell
What is the covalency of nitrogen in N2O5?
Concept: Classification of Crystalline Solids
What type of semiconductor is obtained when silicon is doped with boron?
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors
What type of magnetism is shown in the following alignment of magnetic moments?
Concept: Properties of Solids: Magnetic Properties
What type of point defect is produced when AgCl is doped with CdCl2?
Concept: Imperfections in Solids - Introduction
In body centred cubic structure the space occupied is about
(A) 68% (B) 53%
(C) 38% (D) 32%
Concept: Packing Efficiency >> Efficiency of Packing in Body-centred Cubic Structures
Gold occurs as face centred cube and has a density of 19.30 kg dm-3. Calculate atomic radius of gold. (Molar mass of Au = 197)
Concept: Number of Atoms in a Unit Cell
