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An aqueous solution of FeSO4, Al2(SO4)3 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are :
  • a)
    a colourless filtrate and a green residue
  • b)
    a yellow filtrate and a green residue
  • c)
    a yellow filtrate and a brown residue
  • d)
    a green filtrate and a brown residue
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
An aqueous solution of FeSO4, Al2(SO4)3 and chrome alum is heated with...
TIPS/FORMULAE :
Chrome alum is K2SO4.Cr2(SO4)3.24H2O
The filtrate is yellow due to  ion and residue is brown due to Fe(OH)3.
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Most Upvoted Answer
An aqueous solution of FeSO4, Al2(SO4)3 and chrome alum is heated with...
Solution:
The given aqueous solution contains FeSO4, Al2(SO4)3 and chrome alum. When this solution is heated with excess Na2O2, the following reactions take place:

1) FeSO4 + Na2O2 + H2O → Fe(OH)3 + Na2SO4
2) Al2(SO4)3 + Na2O2 + H2O → 2Al(OH)3 + Na2SO4
3) KCr(SO4)2 + 4Na2O2 + 2H2O → CrO5 + 4Na2SO4 + 2KOH

The above reactions show that the products obtained are insoluble hydroxides of Fe and Al, and soluble salts of Na and K. The chrome alum reacts with excess Na2O2 to form insoluble CrO5 and soluble Na2SO4 and KOH.

Hence, the materials obtained are:
- a yellow filtrate (due to the presence of Na2SO4 and KOH in water) and a brown residue (due to the presence of CrO5 and excess Na2O2)
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Amphoteric oxides,such as aluminium oxide, are soluble both in strongly acidic and in strongly basic solutions. Dissolution of Al(OH)3 in excess base is just a special case of the effect of complex-ion formation on solubility.Al(OH)3 dissolves because excess OH-ions convert it to the soluble complex ion(aluminate ion). The effect of pH on the solubility of Al(OH)3 is shown in figure.Other examples of amphoteric hydroxides include Zn(OH)2,Cr(OH)2,Sn(OH)2 andPb(OH)2, which react with excess OH- ions to from the soluble complexions Zn(OH)42-(zincate ion), Cr(OH)4¯ (chromite ion), Sn(OH)3¯(stannite ion), and Pb(OH3)¯ (plumbite ion),respectively.By contrast, basic hydroxides, such as Mn(OH)2,Fe(OH)2,and Fe(OH)3, dissolve in strong acid but not in strong base.Aluminium is mined as bauxite (Al2O3.xH2O) a hydrated oxide that is always contaminated with Fe2O3 and SiO2. In Bayer process, Al2O3 is purified by some reagents, which of the following reagents will be the best for this purification (Note : Strong heating of precipitate of Al(OH)3 produces Al2O3)

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An aqueous solution of FeSO4, Al2(SO4)3 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are :a)a colourless filtrate and a green residueb)a yellow filtrate and a green residuec)a yellow filtrate and a brown residued)a green filtrate and a brown residueCorrect answer is option 'C'. Can you explain this answer?
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An aqueous solution of FeSO4, Al2(SO4)3 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are :a)a colourless filtrate and a green residueb)a yellow filtrate and a green residuec)a yellow filtrate and a brown residued)a green filtrate and a brown residueCorrect answer is option 'C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about An aqueous solution of FeSO4, Al2(SO4)3 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are :a)a colourless filtrate and a green residueb)a yellow filtrate and a green residuec)a yellow filtrate and a brown residued)a green filtrate and a brown residueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An aqueous solution of FeSO4, Al2(SO4)3 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are :a)a colourless filtrate and a green residueb)a yellow filtrate and a green residuec)a yellow filtrate and a brown residued)a green filtrate and a brown residueCorrect answer is option 'C'. Can you explain this answer?.
Solutions for An aqueous solution of FeSO4, Al2(SO4)3 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are :a)a colourless filtrate and a green residueb)a yellow filtrate and a green residuec)a yellow filtrate and a brown residued)a green filtrate and a brown residueCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
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