Ravi Prakash is teaching live on Unacademy Plus
TOPICS TO BE COVERED: - lonic bond and Favourable condition for ionic bond formation. Covalent bond Co-ordinate covalent bond Fazan's rule-VVI
ONIC BOND - In an ionic bond, the bond formation results due to the electrostatic between oppositely charged ions. It occurs due to the transfer of electrons from cations to anions. -Eg: Na Cl CI A sodium atom A chloride atom A chloride anion A sodium cation NaCI NatCI
FAVOURABLE CONDITION FOR IONIC BOND FORMATION . 1) Less AH (i.e) of metal. 2)more E.A. of non-metal. 3)more E.N. difference between metal and non-metal. 4)Large lattice enthalpy. LATTICE ENTHALPY:- Energy required to break a lattice of solid to convert it into isolated gaseous ions is called lattice enthalpy.
COVALENT BOND - In covalent bonding bond is formed due to mutual sharing of electrons between 2 atoms. Non metal + non metal generally covalent bond formation takes place.
CO-ORDINATE COVALENT BOND - It is also known as DATIVE BOND It occurs when shared pair of electron is provided by single atom, then it is called a co-ordinate covalent bond.
FAZAN'S RULE - Smaller the size of cation and larger the size of anion greater is the polarization and hence the covalent character. - Greater the charge difference between cation and anion, greater is the polarization and hence the covalent character. GAT HASH CATION WITH PSEUDO INERT GAS CONFIGURATION HAS HIGHER POLARI ATIN TEIN CA POLARIZATION THEN CATION WITH NORMAL GAS CONFIGURATION POLARIZATION- Deformation of electron cloud of an anion towards cation is called polarization which leads to development of covalent character in ionic bond.
1 > APPLICATION OF FAZAN'S RULE COVALENT CHARACTER POLARISATION IONIC CHARACTER1/POLARISATION -MELTING POINT, BOILING POINT / POLARIZATION SOLUBILITY IN POLAR SOLVENT 1/POLARISATION oo -SOLUBILITY IN NON POLAR SOLVENT oo POLARIZATION
PRACTICE PROBLEMS ON FAZAN'S RULE ARRANGE THE FOLLOWING-> 1. NaCi, MgCi, AICI, SiCl4 (COVALENT CHARACTER) 2. SnCl2 SnCl4, PCI4 (COVALENT CHARACTER) 3. FeCl2, FeCl3 (IONIC CHARACTER) 4. HgCl2 , HgCh (COVALENT CHARACTER)
5. NaCI, CuCI (MELTING POINT) 6. Li2Co3, Na2Co3, K2Co3 (THERMAL STABILITY) 7. L F, L CI , LiBr, Lil (SOLUBILITY IN BENZENE)