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Standard XII
Chemistry
Preparations and Uses of Sodium Bicarbonate and Common Salt
Compound A is...
Question

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 compound (A) :

A
ZnSO4.7H2O
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B
FeSO4.7H2O
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C
MgSO4.7H2O
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D
CuSO4.5H2O
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Solution

The correct option is B FeSO4.7H2O
(A) is FeSO4⋅7H2O
FeSO4+BaCl2⟶BaSO4↓+FeCl2(B)
2FeSO4Δ−→Fe2O3+SO2+SO3(E)(C)(D)
Fe2O3+6HCl⟶2FeCl3+3H2O(F)
2FeCl3+H2S⟶2FeCl2+2HCl+S(H)(G)
2FeCl3+SnCl2⟶2FeCl2+SnCl4
4FeCl3+3K4Fe(CN)6⟶Fe4[Fe(CN)6]3+13KClPrussianBlue
(FeCl3 gives blood red coloration with thiocyanate ion.)
FeCl3+3KSCN⟶Fe(SCN)3+3KClPotassiumBloodredthiocyanatecoloration

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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).
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. 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).
what is F?

Q. An aqueous solution of salt (A), gives white crystalline precipitate (B) with NaCl solution. The filtrate gives a black precipitate (C) when H2S is passed through it. Compound (B) is dissolves in hot water and the solution gives a yellow precipitate (D) on treating with NaI and cooling. The compound (A) does not give any gas with dilute HCl but liberates reddish brown gas on heating.

Compound (A) is _________.

Q.
A white amorphous powder (A) when heated gives a colourless gas (B), which turns lime water milky and the residue (C) which is yellow when hot but white when cold. The residue (C) dissolves in dilute HCl and the resulting solution gives a white precipitate on addition of potassium ferrocyanide solution. (A) dissolves in dilute HCl with the evolution of a gas which is identical in all respects with (B). The solution of (A) as obtained above gives a white precipitate (D) on addition of excess of NH4OH and on passing H2S. Another portion of this solution gives initially a white precipitate (E) on addition of NaOH which dissolves in excess of it. Compounds (A) to (D) are identified as:

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