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Zinc Ion

A black color...

Question

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 $C H_{3} C O O H$ and aqueous $K_{4} [F e (C N)_{6}]$ , 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 $H N O_{3}$ is obtained.

Identify B.

C O_{2}

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H_{2} S

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S O_{2}

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S O_{3}

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Solution

The correct option is B $H_{2} S$
$\begin{matrix} F e S & + & H_{2} S O_{4} & ⟶ & F e S O_{4} & + & H_{2} S (A) & (B) \end{matrix}$
$\begin{matrix} 2 H N O_{3} & + & 3 H_{2} S & ⟶ & 2 N O & + & 3 S ↓ & + & 4 H_{2} O (C) & (D) \end{matrix}$
$\begin{matrix} C u S O_{4} & + & H_{2} S & ⟶ & C u S ↓ & + & H_{2} S O_{4} (E) & (B) & (F) \end{matrix}$
$3 C u S + 8 H N O_{3} ⟶ 2 C u (N O_{3})_{3} + 2 N O + 3 S$
$C u (N O_{3})_{2} + 2 N H_{4} O H ⟶ C u (O H)_{2} + 2 N H_{4} N O_{3}$
$\begin{matrix} C u (O H)_{2} & + & 4 N H_{3} & ⟶ & [C u (N H_{3})_{4}] (O H)_{2} (b l u e c o m p l e x s o l u t i o n) (G) \end{matrix}$
$\begin{matrix} 2 C u^{2 +} & + & K_{4} F e (C N)_{6} & ⟶ & C u_{2} [F e (C N)_{6}] & + & 4 K^{+} (H) \end{matrix}$
$B a C l_{2} + C u S O_{4} ⟶ B a S O_{4} ↓ + C u C l_{2}$

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Similar questions

Q. A black coloured compound

(A)

on reaction with dilute

H_{2} S O_{4}

gives a gas

(B)

which on passing in a solution of an acid

(C)

gives a white turbidity

(D)

. Gas

(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)

and

(H)

An aqueous solution of an inorganic compound (X) gives the following reactions.

(i) With an aqueous solution of

B a C l_{2}

, a precipitate insoluble in dilute

H C l

is obtained.

(ii) Addition of excess of

K I

gives a brown precipitate which turns white on addition of excess hypo solution.

(iii) With an aqueous solution of potassium ferrocyanide a chocolate colored ppt. is obtained.

Identify X :

Q. An aqueous solution of a gas

(X)

gives the following reactions :
(i) It turns an acidified

K_{2} C r_{2} O_{7}

solution green.
(ii) On boiling it with

H_{2} O_{2}

, cooling it and then adding an aqueous solution of

B a C l_{2}

, a precipitate insoluble in dilute hydrochloric acid is obtained.
(iii) On passing

H_{2} S

in the solution a white turbidity is obtained.
Identify (X).

Q. An aqueous solution of inorganic compound

(X)

gives the following reactions.

(i) with an aqueous solution of

B a C l_{2}

a precipitate insoluble in dilute

H C l

is obtained.
(ii) addition of an excess of

K I

gives a brown appearance that turns white on the addition of an excess of hypo.
(iii) with an aqueous solution of

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

a chocolate coloured precipitate is obtained.

Identify

(X)

Q. A certain metal

(A)

is boiled in dilute

H N O_{3}

to give a salt

(B)

and an oxide of nitrogen

(C)

. An aqueous solution of

(B)

with brine gives a precipitate

(D)

which is soluble in

N H_{4} O H

. On adding aqueous solution of

(B)

to hypo solution, a white precipitate

(E)

is obtained.

(E)

turns black on standing.

Identify

(D)

and

(E)

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