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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Sep 2007 21:07:19 IST
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hey..i m facing a foolish delima why OH- has negative charge...
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18 Sep 2007 21:18:59 IST
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only trust if i m right..........
valency of O= -2
valency of H= +1
hence when O & H combines need of one electron is fulfilled while another one is not.
So, OH haves a -ve charge
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18 Sep 2007 21:56:06 IST
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oh...now its there,,i think that -1 represents the valency of OH-
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18 Sep 2007 23:19:05 IST
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-1 indicates that there is one excess pair of electrons in the radical.
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19 Sep 2007 14:33:13 IST
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draw the structure of the molecule 
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19 Sep 2007 14:35:15 IST
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both of u have different answers
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1 Jan 2008 20:37:20 IST
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Calculate the formal charge on each atom.. and add!
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Will nip in at times to solve problems :)
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1 Jan 2008 22:07:02 IST
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yaar oxygen ka oxidation state is -2 and that of hydrogen is +1.therefore OH has -1 charge.tabhi toh it combines with metals like K,Ca as KOH and Ca(OH)2 as K and Ca have +1 and +2 oxidation state resp.chemical compounds always have 0 oxidation state.
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there are numerous options besides I.I.T
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1 Jan 2008 22:22:24 IST
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Well tarun,
U said that -1 is valency of OH. I think it would be better not use the word VALENCY as it is best defined for elements is atomic state.
Karthik2007,
Formal charge is the charge on atoms OR molecules of the compound which forms crystal lattice. eg-NaCl. We can't define formal charge for O and H in OH- .
OH has 1 -ve charge simply denotes that it is an anion which is unstable and can combine with cations to form compounds.
Hope its clear now.
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