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Zinc Ion

A colorless s...

Question

A colorless solid (A) when placed into water produces a heavy white turbidity to (B). Solid (A) gives a clear solution in $c o n c . H C l$ when $H C l$ 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 solution of sodium stannite.

When compound (A) reacts with $N H_{4} O H$ , then product is a:

A

white ppt

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B

yellow ppt

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C

black ppt

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D

green ppt

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Solution

The correct option is A white ppt
$\begin{matrix} B i C l_{3} & + & H_{2} O & ⟶ & B i O C l ↓ & + & 2 H C l (A) & w h i t e p p t . (B) \end{matrix}$
$\begin{matrix} B i O C l & + & 2 H C l & ⟶ & B i C l_{3} & + & H_{2} O (B) & (A) \end{matrix}$
$\begin{matrix} 2 B i C l_{3} & + & 3 H_{2} S & ⟶ & B i_{2} S_{3} ↓ & + & 6 H C l b r o w n - b l a c k p p t . (C) \end{matrix}$
$B i_{2} S_{3} + 8 H N O_{3} ⟶ 2 B i (N O_{3})_{3} + 3 S ↓ + 2 N O + 4 H_{2} O$
$2 B i (N O_{3})_{3} + 3 H_{2} S O_{4} ⟶ B i_{2} (S O_{4})_{3} + 6 H N O_{3}$
$\begin{matrix} B i_{2} (S O_{4})_{3} & + & 6 N H_{4} O H & ⟶ & 2 B i (O H)_{3} ↓ & + & 3 (N H_{4})_{2} S O_{4} w h i t e p p t . (F) \end{matrix}$
$\begin{matrix} 2 B i (O H)_{3} & + & 3 N a_{2} S n O_{2} & ⟶ & 2 B i & + & 3 N a_{2} S n O_{3} & + & H_{2} O (G) b l a c k p p t . \end{matrix}$
$\begin{matrix} 2 B i C l_{3} & + & 3 H_{2} S O_{4} & ⟶ & B i_{2} (S O_{4})_{3} & + & 6 H C l (D) \end{matrix}$
$\begin{matrix} H g_{2} (N O_{3})_{2} & + & 2 H C l & ⟶ & H g_{2} C l_{2} ↓ & + & 2 H N O_{3} \end{matrix}$

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Similar questions

A black colored compound (A) on reaction with dilute

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 placed in an acidified solution of a compound (E) gives a precipitate (F) soluble in dilute

H N O_{3} .

After boiling this solution, when an excess of

N H_{4} O H

is added, blue colored compound (G) is formed. To this solution on addition of

C H_{3} C O O H

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

, a chocolate precipitate (H) is obtained. On the addition of an aqueous solution of

B a C l_{2}

to an aqueous solution of E, a white ppt insoluble in

H N O_{3}

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).

Q. An inorganic halide

(A)

gives the following reations:
(i) the cation of

(A)

on reaction with

H_{2} S

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}

(B)

on heating with dil.

H C l

gives back compound

(A)

(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)

(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

(F)

(G)

and give balanced chemical equations of reactions.

A black colored (insoluble in

H_{2} O

) solid A does not dissolve in

H N O_{3}

. Aqua regia can dissolve A forming B. B gives yellow precipitate C with

N a O H

. B also gives an orange ppt. D with

K I

. D dissolves in excess of

K I

forming E. E gives brown ppt. with

N H_{4}^{+}

salt in presence of

N a O H

. A is precipitated if

H_{2} S

gas is passed into the solution of B in

d i l . H C l

.

The compound C is :

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