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Standard XII
Chemistry
Preparation of Alkanes with Grignard Reagent
An aqueous so...
Question

An aqueous solution of FeSO4Al2(SO4)3 and chromium alum is heated with excess of Na2O2 and filtered. The material obtained is :

A
a colourless filtrate and green residue
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B
a yellow filtrate and brown residue
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C
a yellow filtrate and a green residue
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D
a green filtrate and a brown residue
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Solution

The correct option is B a yellow filtrate and brown residue
The yellow filtrate contains sodium chromate obtained by the oxidation of Cr(III) ion with sodium peroxide.
The brown residue is of basic ferric sulphate (Fe(OH)(SO4)) which is obtained by the oxidation of ferrous sulphate with sodium peroxide.

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A coin is analysed by dissolving it in nitric acid. To the resulting solution an excess of aqueous Ammonia is added and the mixture is filtered. A brown precipitate remains in the filter paper and a deep blue solution is obtained as the filtrate. Which metals does the coin contain?


Q. A coloured solution known to contain two metal ions was treated with excess cold sodium hydroxide solution. When filtered a whitish solid, slowly changing to brown, was retained on the filter paper and a colourless solution collected as the filtrate. The dropwise addition of hydrochloric acid to the filtrate produced a white ppt. which dissolved in excess acid. Treatment of the residue on filter paper with a solution of a strong oxidiser produced a reddish-violet solution.

Indicate any pairs of ions:

Q. An aqueous solution of FeSO4,Al2(SO4)3 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are:
Q. A compound (A) is greenish crystalline salt which gave the following results :
On heating (A), water vapours and two oxides of sulfur, (C) and (D) are liberated leaving a red-brown residue (E).
(E) dissolves in warm concentrated HCl to give a yellow solution (F).
With H2S, the solution (F) yields a pale yellow ppt. (G), which when filtered, leaves a greenish filtrate (H).
What is compound H?

Q.
Compound (A) is a greenish crystalline salt which gives the following results when tested :

(a) Addition of BaCl2 solution to a solution of (A) results in the formation of a white precipitate (B) which is insoluble in dilute HCl.

(b) On heating, water vapour and two gases (C) and (D) are liberated, leaving a red brown residue (E).

(c) (E) dissolves in conc.HCl to give a yellow solution (F).

(d) With H2S, the solution (F) yields a yellow-white ppt. (G) which when filtrated, leaves a greenish filtrate (H).

(e) The solution (F) gives a green solution with SnCl2, and when reacted with K4[Fe(CN)6] gives a blue ppt.

Identify yellow solution, (F).
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