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Inorganic Chemistry

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Joined:	2 Jun 2008
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23 Sep 2008 18:20:57 IST

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qualitative analysis

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in fehlings reaction,v get ared ppt due to the presence of cuprous ions wich hav a config of 3d 10.all the orbitals of the d subshell r fully filled then how does the d-d transition take place leading to the colour of the ppt????

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Bhaskaryya Baruah

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Joined: 3 Jul 2008

Posts: 812

23 Sep 2008 23:35:10 IST

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while answering dis qsn we hv to see some things. d first one is dat when Cu forms ions, it exists as 4s2 3d9.

agian from definition of transitional metals we got dat these elements possess partially filled d-orbitals. but in fehlings reaction, cuprous ion i.e. Cu+ ion is formed whose configuration is 3d10. therefore Cu, Cu+ ion, Zn etc. r not considered as transitional metal.So, we cant consider d-d transition of Cu+ ion in dis case.

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