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Akash Mourya posted an Question

September 15, 2020 • 15:15 pm

30 points

IIT JAM
Chemistry (CY)

Fazans rule

plz explain the answer which factor is dominant and explain the order

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Amol ashok pawar

The covalent character increases in groups as we go from top to bottom .it decreases in periods as we go from left to right .it increases in groups as the electrons get further away from the nucleus the attractive forces bettween the positive charge of the nucleus and negative charge of the electrons decreases and they are easy to share with their atoms.
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Suman Kumar

see this
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Answer is wrong Akash
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Fajans' Rule Size of the ion: Smaller the size of cation, the larger the size of the anion, greater is the covalent character of the ionic bond.
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Priyanshu kumar

Polarising power of cations depends on charge density...
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In case of Cacl2,Srcl2 and bacl2...anions is same...and cations charge is also same as all three belongs to grp 2 metals
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But down the group,as size increases the charge density decreases so polarising power of cations decreases
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So this decrease in polarising power decreases covalent character
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so covalent character order is CaCl2>SrCl2>BaCl2
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upto this much akash got this na??
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Now come to d block elements parts...s block has less covalent character than d block....
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so accordingly you arrange this...first three has less covalent character than last three
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For Zncl2,cdcl2 and hgcl2 :- Here size of cation is Zn²+ < Cd²+ < Hg²+ and anion in all of them is same Cl-, So according to fajan’s rule order of covalent character is ZnCl2 > CdCl2 > HgCl2
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So overall you conclude the decreasing order of covalent character:- Zncl2>CdCl2>HgCl2>Cacl2>Srcl2>Bacl2
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Hope you got this...Thanks for asking your query😊
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