Definitions [3]
Define unit cell.
A basic repeating structural unit of a crystalline solid is called a unit cell.
Define Anisotropy.
The ability of crystalline solids to change values of physical properties when measured in different directions is called anisotropy.
Define the following term:
Ferromagnetism
Ferromagnetism is defined as the phenomenon in which substances, such as iron, cobalt and nickel, are strongly attracted by a magnetic field. Such substances are called ferromagnetic substances.
Theorems and Laws [1]
Name the law or principle to which the following observations confirm:
When 9650 coulombs of electricity is passed through a solution of copper sulphate, 3.175 g of copper is deposited on the cathode (at. wt. of Cu = 63.5).
Faraday’s first law of electrolysis: The mass of a substance deposited or liberated at an electrode is directly proportional to the quantity of electricity passed through the electrolyte.
Given: Charge passed = 9650 C
Atomic mass of Cu = 63.5
Valency of Cu in CuSO4 = 2
Equivalent mass of Cu = `63.5/2` = 31.75
Now, Mass deposited = `9650/96500 xx 31.75`
= 0.1 × 31.75
= 3.175 g
Important Questions [6]
- Name the law or principle to which the following observations confirm: When 9650 coulombs of electricity is passed through a solution of copper sulphate, 3.175 g of copper is deposited on the cathode
- The Complexion Ni(Cn)42- Is:
- Explain Why: (I) Transition Elements Form Coloured Compounds. (Ii) Interhalogen Compounds Are More Reactive than Their Constituent Elements. (Iii) Cu+ Is Diamagnetic but Cu2+ Is Paramagnetic. (Z = 29)
- Which one of the following compounds is diamagnetic and colourless?
- Give a reason for the following: Cu+2 salts are paramagnetic, while Cu+ salts are diamagnetic.
- The metal complex ion that is paramagnetic is ______. (Atomic number of Fe = 26, Cu = 29, Co = 27 and Ni = 28)
Concepts [29]
- Introduction to Solid State
- Classification of Solids
- Classification of Crystalline Solids
- Space Lattice
- Definition of Unit Cell
- Different Types of Cubic Systems
- Number of Particles Per Unit Cell in Different Cubic Systems
- Calculation of the Space Occupied (Packing Fraction) in the Unit Cells of Different Types of Cubic Systems
- Calculation of Density of a Crystal
- Close-packed Structures
- Packing of Constituent Particles in Crystals
- Voids in Close-Packed Structures
- Dimensions of Voids
- Location of Tetrahedral Voids
- Location of Octahedral Voids
- Radius Ratio Rules
- Number of Voids Filled and the Formula of the Compound
- Types of Crystalline Solids: Molecular Solids
- Types of Crystalline Solids: Ionic Solids
- Types of Crystalline Solids: Covalent Solids {Atomic or Network Solids)
- Types of Crystalline Solids: Metallic Solids
- Imperfections (Defects) in Solids
- Imperfections (Defects) in Solids: Electronic Imperfections
- Imperfections (Defects) in Solids: Atomic Imperfections
- Imperfections (Defects) Caused by Impurities
- Properties of Solids: Electrical Properties
- Properties of Solids: Magnetic Properties
- Properties of Solids: Dielectric Properties
- Amorphous Solids
