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State Fajan's rule regarding the partial...

State Fajan's rule regarding the partial covalent character of an ionic bond.

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Knowledge Check

  • Statement 1 : According to Fajan's rule, covalent character is favoured by small cation and small anion. Statement 2 : The magnitude of ionic character in the ionic bond depends upon the extent of polarization.

    A
    Statement 1 is True, statement 2 is True, Statement 2 is Correct explanation for Statement 1.
    B
    Statement 1 is True, Statement 2 is True, Statement 2 is NOT a correct explanation for Statement 1.
    C
    Statement 1 is True, Statement 2 is False.
    D
    Statement 1 is False, Statement 2 is True.

  • In an ionic bond, the cation tends to polarize the electron cloud of the anion by pulling electron dens towards itself. This causes development of covalent character in the ionic bond because the electron dens gets localised in-between the nuclei. The tendency of the cation to bring about the polarization of the anion expressed as its polarizing power. The ability of ion to undergo polarization is called its polarisability. The polarising power of a cation or an anion is decided on the basis of Fajans' rules. The ionic conductance of which of the following is the highest?

    A
    `Li^+(aq) `
    B
    `Na^+ (aq)`
    C
    `K^+ (aq)`
    D
    `Cs^+ (aq)`

  • In an ionic bond, the cation tends to polarize the electron cloud of the anion by pulling electron dens towards itself. This causes development of covalent character in the ionic bond because the electron dens gets localised in-between the nuclei. The tendency of the cation to bring about the polarization of the anion expressed as its polarizing power. The ability of ion to undergo polarization is called its polarisability. The polarising power of a cation or an anion is decided on the basis of Fajans' rules. Arrange the following species in decreasing order of polarising powers: Ag^+ , Tl^+ , Na^+

    A
    `Tl gt Ag gt Na^+`
    B
    `Tl^+ lt Na^+ lt Ag^+`
    C
    `Ag^+ gt Tl^+ gt Na^+`
    D
    `Na^+ gt Tl^+ gt Ag^+`

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    In an ionic bond, the cation tends to polarize the electron cloud of the anion by pulling electron dens towards itself. This causes development of covalent character in the ionic bond because the electron dens gets localised in-between the nuclei. The tendency of the cation to bring about the polarization of the anion expressed as its polarizing power. The ability of ion to undergo polarization is called its polarisability. The polarising power of a cation or an anion is decided on the basis of Fajans' rules. Among the following which will have the lowest melting point and the highest solubility in polar solvent: LiCl, BeCl_2, BCl_3, "CCl"_4

    The correct sequence of increasing covalent character is

    The correct sequence of increasing covalent character is

    Which of the following is max. covalent character?

    Assertion : Carbon oxygen bond length of phenol is slightly less than that in methanol. Reason : There exist a partial double bond character and carbon to which oxygen is attached in phenol is sp^2 hybridised.

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