Qualitative Analysis - Result Question 18

####18. An aqueous solution $FeSO _4 \cdot Al _2\left(SO _4\right) _3$ and chrome alum is heated with excess of $Na _2 O _2$ 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

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Answer:

Correct Answer: 18. (c)

Solution:

  1. Yellow filtrate contains $CrO _5$ and brown residue contain $Fe _2 O _3$.


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