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[Post New] 3 Feb 2010 17:04:31 IST
   Subject: a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B w
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shubham (2)

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a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B which on acidification gives an orange colored compound C . C on treatment with NH4Cl gives orange colored compound D which on heating gives back A . identify A , B ,C , D and write balanced reactions involved .
    

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[Post New] 3 Feb 2010 17:11:04 IST
   Subject: a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B which
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siri acha (0)

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ask the mentor of rgukt
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[Post New] 9 Feb 2010 16:26:05 IST
   Subject: a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B which
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winx (791)

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...................nid ans 4 dis question..............

ny1 here  2 help me plzzzzzz
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[Post New] 9 Feb 2010 17:33:08 IST
   Subject: a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B w
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SRIJAN MISHRA (29)

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 A -Cr2O3

B - CrO4-2

C - Cr2O7-2

D - NH4Cr2O7
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[Post New] 9 Feb 2010 18:39:35 IST
   Subject: a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B w
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Akshay (271)

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Answer given by Srijan r correct.

The reaction is

Cr2O3 (fusion with alkali) ---> CrO42-  (on acidification) --->Cr2O72-  +NH4Cl ---> (NH4)2Cr2O7 (on heating)--> Cr2O3

The chemical reactions r

2Cr2O3 + 8OH- + 3O2 --> 4CrO42- + 4H2O

2CrO42- + H2SO4 --> Cr2O72- + SO42- + H2O

Cr 2O72- + 2NH4Cl --> (NH4)2Cr2O7 +2Cl-

(NH4)2Cr2O7 (on heating) --> Cr2O3 + N2 +4H2O
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[Post New] 9 Feb 2010 19:18:34 IST
   Subject: a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B which
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winx (791)

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THANX A LOT
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