What is Fajans rule explain briefly?
Fajans’ rule predicts whether a chemical bond will be covalent or ionic. A few ionic bonds have partial covalent characteristics which were first discussed by Kazimierz Fajans in 1923.
What is the application of Fajans rule?
Application of Fajan’s rule
Fajan’s rule can be used to explain the properties such as covalent character, ionic character, ionic character, melting points, solubility, etc of the ionic compounds. For example, The melting points of the NaCl, MgCl2, and AlCl3 can be compared by using fajan’s rule.
What is fazan rule in chemistry?
According to Fajans’ rule, an ionic bond is formed by a compound with a low positive charge, a large cation, and a small anion, whereas a covalent bond is formed by a compound with a high positive charge, a small cation, and a large anion.
How does Polarising power effects in Fajans rule and how does it effect in ionic nature of Com pound?
Explanation: According to Fajan’s rules, the greater the charge the greater is the polarizing power of cation. Explanation: Among cations, Al3+ has smaller size and greater charge hence it has greater polarizing power. Among anions, iodide (I-) is larger and hence can be polarized easily.
Who invented fajans rule?
Kazimierz Fajans
2 Answers. Show activity on this post. Fajans’ rules (note the difference) were formulated in 1923 by Kazimierz Fajans.
What is Fajan’s rule Class 11?
The rule says that for cations with same charge and size, the cation with electronic configuration (n−1)dnns0which is found in transition elements have greater covalent character than the cation with electronic configuration ns2np6 which is found in alkali or alkali earth metals.
What is polarization in chemistry?
In electrochemistry, polarization is a collective term for certain mechanical side-effects (of an electrochemical process) by which isolating barriers develop at the interface between electrode and electrolyte.
Which is most ionic According to Fajans rule?
According to Fajan’s Rule, Greater is the charge on the cation, greater will be the covalent character in the bond. Since, NaCl has low charge on cation(Na+) it has the most ionic character.
What is Fajans rule Class 11 chemistry?
Who invented Fajans rule?
What is Polarising power and Polarisability?
The ability of a cation to distort an anion is known as its polarization power and the tendency of the anion to become polarized by the cation is known as its polarizability.
Why does polarizability increase down group?
Since polarizability is when atoms and ions have electron clouds that easily undergo large distortion, larger atoms are more polarizable compared to smaller atoms. So, polarizability increases going down a group, but decreases going across a period.
Which compound are used as indicator in Fajans method?
dichlorofluorescein
In the Fajans method, named after Kazimierz Fajans, typically dichlorofluorescein is used as an indicator; the end-point is marked by the green suspension turning pink.
What is Fajans rule Toppr?
According to Fajan’s rule, ionic character increases for:
Medium. > Chemical Bonding and Molecular Structure.
What is polarization in chemistry class 11?
Polarisation is the distortion of a negatively charged ion’s electron cloud by a positively charged ion. The molecule has a dipole moment because of polarisation.
What are the types of polarization?
Following are the three types of polarization depending how the electric field is oriented: Linear polarization. Circular polarization. Elliptical polarization.
What is the formula of polarizability?
Polarizability of the molecule is defined as the electric dipole moment induced in the molecule per unit incident electric field. Polarizability α=EP. Units α=N/CC m=C2mN−1.
Which ion is most Polarising?
Al+3
Polarizing power depends on cation size and cation charge, so larger cation charge and lower cation size have greater polarising power. Al+3, thus has the highest polarising power.
What is polarization of ion?
Ionic polarization occurs in ionic compounds, in which the oppositely charged ions move in opposite directions under the influence of the electric field to produce a net dipole moment in them.
What is Polarising power Class 11?
The ability of a cation to distort an anion is known as its polarization power and the tendency of the anion to become polarized by the cation is known as its polarizability. Suggest Corrections.
What is Polarising power formula?
According to Fajan’s rule, higher the charge on the cation, more is its polarizing power. The next factor which is considered is the size of the cation. Smaller the size of the cation, higher is its polarizing power. Hence, the order of polarizing power is Cs+<K+<Mg2+<Al3+.
What factors affect polarizability?
Molecular orientation, atomic radii, and electron density are the main three factors that influence the Polarizability in the following way: As the number of electrons increases, the control on distribution of charge by the nuclear charges becomes less, and thus the Polarizability of atom increased.
Which titrant is used in Fajan method?
Which titrant is used in the Fajan method? In the Fajans method for Cl-, Ag+ is used as a titrant. This method is used to detect the concentration of chloride is in a sample. The sample solution is titrated against a known concentration of silver nitrate (AgNO3) solution.
Is Fajans method direct titration?
It is an indirect method of precipitation. This method was given by American chemist Kazimierz Fajan. That’s why it is known as fajan’s method. This method is also known as the indicator adsorption method because in this method chloride ions present in excess are adsorbed on silver chloride surface.