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Preparations and Uses of Sodium Carbonate

On mixing the...

Question

On mixing the aqueous solutions of compounds $(A)$ and $(B)$ , an insoluble compound $(C)$ is produced along with another water soluble compound $(D)$ . Compound $(A)$ on heating gives brown $N O_{2}$ gas with a cracking noise. An aqueous solution of compound $(A)$ gives black ppt. with $H_{2} S$ gas. Compound $(A)$ also gives white ppt. with dil. $H C l$ which is soluble in hot water and reappears on cooling. The hot water extract of compound $(A)$ gives yellow ppt. with $K_{2} C r O_{4}$ solution.

A

(A) - P b (N O_{3})_{2}

(B) - F e S O_{4}

(C) - P b S O_{4}

(D) - F e (N O_{3})_{2}

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B

(A) - P b (N O_{3})_{3}

(B) - F e S O_{4}

(C) - P b S O_{4}

(D) - F e (N O_{3})_{3}

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C

(A) - P b (N O_{3})_{2}

(B) - F e S O_{4}

(C) - P b S O_{4}

(D) - F e (N O_{3})_{3}

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D

(A) - P b (N O_{3})_{3}

(B) - F e S O_{4}

(C) - P b S O_{4}

(D) - F e (N O_{3})_{2}

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Solution

The correct option is A $(A) - P b (N O_{3})_{2}$ $(B) - F e S O_{4}$ $(C) - P b S O_{4}$ $(D) - F e (N O_{3})_{2}$
Option (A) is correct.
$P b (N O_{3})_{2} [A] + F e S O_{4} [B] ⟶ P b S O_{4} [C] + F e (N O_{3})_{2} [D]$
$P b (N O_{3})_{2} ⟶ P b O + N O_{2} + O_{2}$
$P b (N O_{3})_{2} + H_{2} S ⟶ P b S (b l a c k p p t) + H N O_{3}$
$P b (N O_{3})_{2} + H C l ⟶ P b C l_{2} (w h i t e p p t) + H N O_{3}$
$P b C l_{2} + K_{2} C r O_{4} ⟶ P b C r O_{4} (y e l l o w p p t) + K C l$

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Similar questions

Q. An aqueous solution of salt (A) gives a white crystalline precipitate (B) with NaCl solution. The filtrate gives a black precipitate (C) when

H_{2} S

is passed through it. Compound (B) dissolves in hot water and the solution gives yellow precipitate (D) on treatment with potassium iodine and on cooling. The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating. Compounds (A) to (D) are identified as:

P b (N O_{3})_{3}

P b C l_{2}

P b S

P b I_{2}

If true enter 1, else enter 0.

An aqueous solution of salt (A), gives white crystalline precipitate (B) with NaCl solution. The filtrate gives a black precipitate (C) when

H_{2} S

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 (B) is:

Q. (i) A black mineral (A) on heating in presence of air gives a gas (B).
(ii) The mineral (A) on reaction with dilute

H_{2} S O_{4}

gives a gas (C) and solution of a compound (D).
(iii) On passing gas (C) into an aqueous solution (B), a white turbidity is obtained.
(iv) The aqueous solution of compound (D) on reaction with potassium ferricyanide gives a blue compound (E).

Compounds (A) to (E) are identified as:

F e S

S O_{2}

H_{2} S

F e S O_{4}

K F e^{I} I [F e^{I} I I (C N)_{6}]

If true enter 1, else enter 0.

An aqueous solution of a salt (A) gives white precipitate (B) with sodium chloride solution. The filtrate gives a black precipitate. (C) When $H_{2} S$ is passed into it. Compound (B) dissolves in hot water and the solution gives a yellow precipitate (D) on treatment with sodium iodide. The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating. Identify the compound (A) to (D).

A black colored compound (A) on reaction with

d i l . H_{2} S O_{4}

gives a gas (B) which on passing in a solution of acid (C) gives white turbidity (D). Gas (B) when passed in an acidified solution of a compound (E) gives a black precipitate (F) which is soluble in hot concentrated (C). After boiling this solution when an excess of ammonia solution is added, a blue-colored compound (G) is formed. To the solution of (E), on the addition of acetic acid and aqueous potassium ferrocyanide, a chocolate brown precipitate (H) is formed. On the addition of an aqueous solution of

B a C l_{2}

to an aqueous solution of (E), white precipitate insoluble in

H N O_{3}

The gas (B) on passing through an acid (C) gives white turbidity (D) because :

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