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Uses of Slaked Lime

An inorganic ...

Question

An inorganic halide $(A)$ gives the following reations:
(i) the cation of $(A)$ on reaction with $H_{2} S$ in $H C l$ medium, gives a black ppt. of $(B)$ . $(A)$ neither gives ppt. with $H C l$ nor blue colour with $K_{4} F e (C N)_{6}$ .
(ii) $(B)$ on heating with dil. $H C l$ gives back compound $(A)$ and a gas $(C)$ which gives a black ppt. With lead acetate solution.
(iii) the anion of $(A)$ gives chromyl chloride test.
(iv) $(B)$ dissolves in hot dil. $H N O_{3}$ to give a solution, $(D)$ . $(D)$ gives ring test.
(v) when $N H_{4} O H$ solution is added to $(D)$ , a white precipitate $(E)$ is formed. $(E)$ dissolves in minimum amount of dil. $H C l$ to give a solution of $(A)$ . Aqueous solution of $(A)$ on addition of water gives a whitish turbidity $(F)$ .
(vi) aqueous solution of $(A)$ on warming with alkaline sodium stannite gives a black precipitate of a metal $(G)$ and sodium stannate. The metal $(G)$ dissolves in hydrochloride acid to give solution of $A$ .

Identify $(F)$ and $(G)$ and give balanced chemical equations of reactions.

A

(F) B i O C l

(G) B i

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B

(F) S i O C l

(G) S i

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C

(F) P b O C l

(G) P b

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D

None of these

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Solution

The correct option is A $(F) B i O C l$ $(G) B i$
(i) $B i C l_{3} [A] + H_{2} S ⟶ B i_{2} S_{3} [B] + H C l$

(ii) $B i_{2} S_{3} + H C l ⟶ B i C l_{3} + H_{2} S [C]$

$H_{2} S + (C H_{3} C O O)_{2} P b ⟶ P b S (b l a c k p p t) + C H_{3} C O O H$

(iii) $B i C l_{3} + K_{2} C r_{2} O_{7} + H_{2} S O_{4} ⟶ K H S O_{4} + C r O_{2} C l_{2} + N a H S O_{4} + H_{2} O$

(iv) $B i_{2} S_{3} + H N O_{3} ⟶ B i (N O_{3})_{3} [D] + N O + S + H_{2} O$
Ring test is due to nitrate anion.

(v) $B i (N O_{3})_{3} + N H_{4} O H ⟶ B i (O H)_{3} [E] + N H_{4} N O_{3}$
$B i (O H)_{3} + H C l ⟶ B i C l_{3} + H_{2} O$

$B i C l_{3} + H_{2} O ⟶ B i O C l [F] + H C l$

(vi) $B i C l_{3} + N a_{2} S n O_{2} + N a O H ⟶ N a_{2} S n O_{3} + B i [G] + N a C l + H_{2} O$

$B i + H C l ⟶ B i C l_{3} + H_{2}$

Thus, (F) is BiOCl and (G) is Bi

Hence, the correct option is $A$

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Similar questions

Q. Metal nitrate

(A)

on heating decomposes, leaving a residue

(B)

which goes into the solution with dil.

H C l

. The solution of

(B)

gives a white ppt. with an ammonium carbonate solution. Ppt.

C

dissolves in dil.

H C l

and the solution is treated with potassium chromate to yellow ppt.

(D)

V

H_{2} S O_{4}

also gives white ppt.

(E)

insoluble in dil.

H C l

and nitric acid. Precipitate

(E)

is part of white pigment lithopone.

The yellow precipitate

(D)

Q. A black coloured compound

(A)

on reaction with dilute

H_{2} S O_{4}

(B)

which on passing in a solution of an acid

(C)

gives a white turbidity

(D)

(B)

when passed in an acidified solution of a compound

(E)

gives a precipitate

(F)

soluble in dil.

H N O_{3}

. After boiling this solution when an excess of

N H_{4} O H

is added, a blue coloured compound

(G)

is formed. To this solution on addition of acetic acid and aqueous

K_{4} [F e (C N)_{6}]

a chocolate precipitate

(H)

is obtained. On addition of an aqueous soluion of

B a C l_{2}

to an aqueous solution of

(E)

, a white precipitate insoluble in

H N O_{3}

is obtained. Identify

(G)

(H)

.

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 colorless solid (A), when placed into water, produces heavy white turbidity to (B). Solid (A) gives a clear solution in

c o n c . H C l

H C l

solution is added to large amounts of water, (B) forms again. (B) dissolves in dilute HCl. When

H_{2} S

is passed through a suspension of (A) or (B); a black precipitate (C) forms, (C) is insoluble in yellow ammonium sulphide

(N H_{4})_{2} S

C o n c . H_{2} S O_{4}

added to solid (A) liberates gas (D). Gas(D) is water-soluble and gives white precipitate with mercuric salts (E) and not mercuric salts. The black precipitate (C) dissolves in

H N O_{3}

(1:1) to give a solution to which

H_{2} S O_{4}

is added followed by addition of

N H_{4} O H

when a white precipitate (F) is formed. (E) gives a black ppt. (G) with a solution of sodium stannite.

Compound B is not soluble in:

Q. On mixing the aqueous solutions of compounds

(A)

(B)

, an insoluble compound

(C)

is produced along with another water soluble compound

(D)

(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

(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}

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