21[2]
an aq solution of FeSO4 ,Al2(SO4)3 and chrome alum is heated wid excess Na2O2 and filtered .d materials obtained are
a)a colurless filtrate n green residue
b)yellow filtrate n green residue
c)yellow filtrate n brown residue
d)green filtrate n brown residue
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10 Answers
11I think ans shud be C
bec.
FeSO4 is oxidsed bu Na2O2 to Fe(OH)3 [BROWN]
Cr3+ with Na2O2 gives Chromate [YELLOW]
11the answer id C as i told earlier
this is an IIT 1996 question
the filtrate is yellow due to the presence of CrO4-and the reidue is brown due to Fe(OH)3
11sorry.......haan sahi hai...ans is C....(chromate toh yellow hi hota hai.)