An aqueous solution of \[FeS{{O}_{4}},A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] and chrome alum is heated with excess of \[N{{a}_{2}}{{O}_{2}}\] and filtered. The materials obtained are:

a green filtrate and a brown residue

a colourless filtrate and a green residue

a yellow filtrate and a green residue

a yellow filtrate and a brown residue

An aqueous solution of \[FeS{{O}_{4}},A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]

1.	An aqueous solution of \[FeS{{O}_{4}},A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] and chrome alum is heated with excess of \[N{{a}_{2}}{{O}_{2}}\] 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
Answer» D. a green filtrate and a brown residue

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An aqueous solution of \[FeS{{O}_{4}},A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] and chrome alum is heated with excess of \[N{{a}_{2}}{{O}_{2}}\] and filtered. The materials obtained are:

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