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According to Fajans'rules, the percentag...

According to Fajans'rules, the percentage of covalent character in an ionic compound increase if the cation is highly charged or small in size and the anion is large or cation has pseudoinert gas configuration. As a result of the increased covalent character, solubility in less polar solvent increases and the melting point decreases.
Which of the following has the lowest melting point?

A

`KCl`

B

`LiCl`

C

`CsCl`

D

`RbCl`

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To determine which compound has the lowest melting point based on Fajans' rules, we will analyze the covalent character of various ionic compounds formed by alkaline earth metals. Here’s a step-by-step solution: ### Step 1: Understand Fajans' Rules Fajans' rules state that the covalent character of an ionic compound increases when: - The cation is highly charged or small in size. - The anion is large or the cation has a pseudoinert gas configuration. ### Step 2: Identify the Compounds We need to consider the ionic compounds formed by alkaline earth metals (Group 2) and their respective anions. Common examples include: - BeCl₂ - MgCl₂ - CaCl₂ - SrCl₂ - BaCl₂ ### Step 3: Analyze the Cation Size and Charge In alkaline earth metals, the cation charge is +2 for all. However, the size of the cations increases down the group: - Beryllium (Be²⁺) is the smallest. - Magnesium (Mg²⁺) is larger than Be²⁺. - Calcium (Ca²⁺) is larger than Mg²⁺. - Strontium (Sr²⁺) is larger than Ca²⁺. - Barium (Ba²⁺) is the largest. ### Step 4: Determine Covalent Character According to Fajans' rules: - Smaller cations lead to higher covalent character. - Therefore, Be²⁺ will have the highest covalent character among the alkaline earth metals due to its small size. ### Step 5: Predict Melting Points As the covalent character increases, the melting point of the compound decreases. Thus, the compound with the highest covalent character (BeCl₂) will have the lowest melting point. ### Conclusion Based on the analysis, **BeCl₂** has the lowest melting point among the given compounds due to its high covalent character. ---
To determine which compound has the lowest melting point based on Fajans' rules, we will analyze the covalent character of various ionic compounds formed by alkaline earth metals. Here’s a step-by-step solution: ### Step 1: Understand Fajans' Rules Fajans' rules state that the covalent character of an ionic compound increases when: - The cation is highly charged or small in size. - The anion is large or the cation has a pseudoinert gas configuration. ### Step 2: Identify the Compounds ...
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According to Fajans'rules, the percentage of covalent character in an ionic compound increase if the cation is highly charged or small in size and the anion is large or cation has pseudoinert gas configuration. As a result of the increased covalent character, solubility in less polar solvent increases and the melting point decreases. Which of the following has highest melting point?

According to Fajans'rules, the percentage of covalent character in an ionic compound increase if the cation is highly charged or small in size and the anion is large or cation has pseudoinert gas configuration. As a result of the increased covalent character, solubility in less polar solvent increases and the melting point decreases. The correct order of increasing ionic character is

According to Fajans'rules, the percentage of covalent character in an ionic compound increase if the cation is highly charged or small in size and the anion is large or cation has pseudoinert gas configuration. As a result of the increased covalent character, solubility in less polar solvent increases and the melting point decreases. The correct order of increasing ionic character is

Which of the following has been arranged order of increasing covalent character ? .

in an ionic bond the cation tends to polarise the electron cloud of the anion by pulling electron density towards itself This causes development of covalent character in the ionic bond because the electron density gets localised in between the nuclei The tendency of the cation to bring about the polarisation of the anion is expressed as its polasising power The ability of ion to undergo polarisation is called its polarisability The polarising power of a cation or an anion is decided on the basis of F ajans' rules as follows . (i) The smaller the cation, the higher is its polarising power (ii) Cations with pseudo-noble gas configuration (ns^(2)np^(6)nd^(10)) have relatively high polarising power than those with noble gas configuration (ns^(2) np^(6)) (iii) The larger the size of the anion, the higher is its polarisability The ionic conductance of which of the following is the highest ? .

in an ionic bond the cation tends to polarise the electron cloud of the anion by pulling electron density towards itself This causes development of covalent character in the ionic bond because the electron density gets localised in between the nuclei The tendency of the cation to bring about the polarisation of the anion is expressed as its polasising power The ability of ion to undergo polarisation is called its polarisability The polarising power of a cation or an anion is decided on the basis of F ajans' rules as follows . (i) The smaller the cation, the higher is its polarising power (ii) Cations with pseudo-noble gas configuration (ns^(2)np^(6)nd^(10)) have relatively high polarising power than those with noble gas configuration (ns^(2) np^(6)) (iii) The larger the size of the anion, the higher is its polarisability Choose the correct order of polarisability for the following I^(Θ),Br^(Θ),CI^(Θ)F^(Θ) .

in an ionic bond the cation tends to polarise the electron cloud of the anion by pulling electron density towards itself This causes development of covalent character in the ionic bond because the electron density gets localised in between the nuclei The tendency of the cation to bring about the polarisation of the anion is expressed as its polasising power The ability of ion to undergo polarisation is called its polarisability The polarising power of a cation or an anion is decided on the basis of F ajans' rules as follows . (i) The smaller the cation, the higher is its polarising power (ii) Cations with pseudo-noble gas configuration (ns^(2)np^(6)nd^(10)) have relatively high polarising power than those with noble gas configuration (ns^(2) np^(6)) (iii) The larger the size of the anion, the higher is its polarisability Arranfe of the following species in dereasing order of polarising powers Ag^(o+),TI^(o+),Na^(o+) .

Whenever, anion and cation approach each other, the valence shell of the anion is pulled towards the uncleus of the anion is pulled towards the nucles of the cation and as a result, the shape of the anion gets cation is known as polarization of polarizing an amion by a cation is known as polarrization. The ability or capacity of a cation of polarizethe anion towards litsef, is known as its polarizing power. Similiarty. the ability or capacity of an anion to get polarized by the cation, is known as its polarizability. As a result of polarisation, the two ions tend to come closer and the ionic character of the ionic ond acquired partial covalent character. The magnitude of polarization depends upon a number of factors whihc were suggested by Fazan and are termed as Fazan rules. Which has the minimum melting point ?

In which of the following options order of arrangement does not agree with the variatioin of property indicated against it? Thinking process. i) The ionic size increases as the positive charge on the cation decreases or the negative charge on the anion increases. ii) First ionisation enthalpy increases from left to right in the periodic table. iii) Electron gain enthalpy increases as the electronegativity of the atom increases. iv) The metallic character increases as the size of the metal atom increases.

Assertion: Increasing order of covalent character among given compounds is HgCl_(2)ltCdCl_(2)ltZnCl_(2) Reason: Order of size of cations is Zn^(2+)ltCd^(2+)ltHg^(2+) .

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