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![[Post New]](/templates/default/images/icon_minipost_new.gif) 3 Feb 2007 12:31:00 IST
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This is a JEE2006 question.Please reply. A solution when diluted wid H2O and boiled,it gives a white ppt.On addition of excess NH4Cl /NH4OH,the vol. of ppt. decreases leaving behind a white gelatinous ppt.Identify the ppt. which dissolves in NH4OH / NH4Cl.
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megha |
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3 Feb 2007 12:45:27 IST
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hi megha
i have got a clue for this Q you should have got it too
that tis Q relates to salt analysis if you go through salt analysis...
you will get it...good luck for the exams i am also searching
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3 Feb 2007 12:48:58 IST
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hi manoj,
thnx 4 ur reply.but i need d correct ans.plz reply soon!!!
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megha |
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3 Feb 2007 13:06:32 IST
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yeah its a jee2006 question and the answer to this is Zn(OH)2.... when excess of ammonium chloride is added in presence of ammoniumhydroxide, it forma a complex, giving white ppt of tetraammine zinc(II) Zn 2+ + NH4OH --------> [Zn (NH)3] 2+ it forms a complex, as the reagents are in excess....
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Manasi....
NIT-Allahabad...
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3 Feb 2007 13:10:55 IST
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but mansi,i think ihe ans shud b aluminium hydroxide.it is d white gelatinous ppt.i hav even reffered j.d.lee.plz reply
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megha |
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3 Feb 2007 13:15:00 IST
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The ans is aluminium hydroxide since it gives gelatinous white ppt.Zn gives brown ppt.
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ADARSH
NITK Surathkal
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3 Feb 2007 13:19:49 IST
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yes!this is given in J.D.Lee.but can u explain me in detail?
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megha |
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8 Feb 2007 18:52:11 IST
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The precipitate dissolving in excess NH4OH is Zn(OH)2.
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Lecturar, Organic Chemistry |
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12 Feb 2007 18:11:21 IST
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the ans is zinc hydroxide............it was delibrately given by the paper setter as most students will go for aluminium hydroxide on seeing gel. ppt. but note the line vol. decreases..........
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