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![[Post New]](/templates/default/images/icon_minipost_new.gif) 30 Mar 2007 16:49:29 IST
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how does the melting and boiling point decrease down the group.
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30 Mar 2007 17:24:20 IST
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which group are you talking about mention.
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30 Mar 2007 17:40:06 IST
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13
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31 Mar 2007 13:23:37 IST
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 Metallic character increases down the group i.e. ease of forming +ve ions increases down the group. now due 2 intermolecular repulsion between molecules of more electro+ve elements melting n boiling pt. r low whereas the elements on the top r more covalent in nature thus more neutral than those at the bottom i.e. there is negligible intermolecular repulsion as compared 2 those at the bottom..I m not sure of my ans. plz correct my mistakes if u find any.
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31 Mar 2007 14:15:54 IST
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in this regard,fajan's rule is imp 2,for eg comparing bet nacl and mgcl2,mgcl2 has lesser melting pt than nacl as it has more covalent character[grtr the charge on cation grtr the polarisation power.simillarly,going down the grp polarisation powwer decand ionic ch increases
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31 Mar 2007 14:21:10 IST
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its not due to formation of ions repulsion is due to presence of electrons rest is correct
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31 Mar 2007 14:42:42 IST
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melting point & boiling point along a group......... as v move down in a group, the metallic nature increases so the melting and the boiling pt also increases i suppose iam not wrong...if so do correct me!!!!... do rate me ..if u like it.........
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2 Apr 2007 11:19:09 IST
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mp bp increses down the group. because AL has obiously higher mp bp than boran.
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2 Apr 2007 14:27:38 IST
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I think the bp increases down the group cuz metal-metal bond strength decreases down the group due to increasing size of the atoms. m not sure. plz correct me if i'm wrong......
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