Qualitative Analysis - Result Question 18

An aqueous solution $FeSO_4 \cdot Al_2(SO_4)_3$ and chrome alum is heated with excess of $Na_2O_2$ and filtered. The materials obtained are

(1996, 1M)

(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 brown residue

Show Answer

Answer:

Correct Answer: 18. (c)

Solution:

Yellow filtrate contains $Cr_2O_7^{2-}$ and brown residue contains $Fe_2O_3$.

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