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Ankit Singh posted an Question
June 28, 2020 • 19:02 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Ques. arrange the following in decreasing order of covalent characters hgcl, baci, zncl, srcl, cdcl, cacl, s-block have less covalent characters than d-block so

Ques. Arrange the following in decreasing order of covalent characters HgCl, BaCI, ZnCl, SrCl, CdCl, CaCl, S-block have less covalent characters than d-block Sol.

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    Dinesh khalmaniya 1

    we can apply fajan’s rule.. Which states “cation with smaller size and greater charge and anion with larger size and less charge has more polarizing power” So a more covalent compound is formed with smaller cation and largerer anion. so in the case of Ca2+ ,Sr2+ and Ba2+ the covalent character is Ca2+ > Sr2+>Ba2+ but in the case of Zn2+ ,Cd2+, Hg2+ order will be reversed as Zn2+ CdCl2>ZnCl2> CaCl2>SrCl2>BaCl2

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    Zncl2

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    this trend will be applicable to Cu Ag and Au also .....right?

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    yes, you are absolutely right

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    Priyanshu kumar

    https://lavelle.chem.ucla.edu/forum/viewtopic.php?t=16329 for more detail go through this link ankit

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    Priyanshu kumar best-answer

    we can apply fajan’s rule.. Which states “cation with smaller size and greater charge and anion with larger size and less charge has more polarizing power” So a more covalent compound is formed with smaller cation and larger anion.

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    Ankit got it??

  • Suman Kumar

    Ba>Sr>Ca>Hg> Cd>Zn . This is the order for ionic character.

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    Priyanshu kumar

    ZnCl2 and CdCl2 have more ionic character and HgCL2 pssess covalent character

  • Suman Kumar Best Answer

    MgCl2 < CaCl2 < SrCl2 < BaCl2. ZnCl2, CdCl2 are ionic but less than IIA, HgCl2 is covalent

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    So according to fajan’s rule order of covalent character is ZnCl2 > CdCl2 > HgCl2

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    tell me the order of zeffective for zn , cd and hg

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    Priyanshu kumar best-answer

    with increase in size,the covalent character increases as Zeff nuclear charges incresaes

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