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Byju's Answer

Standard XII

Chemistry

Polyhalogen Compounds

A black color...

Question

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 $H N O_{3}$ is obtained.

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

gas (B) acts as an oxidizing agent

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gas (B) acts as an reducing agent

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acid (C) acts as an oxidizing agent

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(b) and (c) both

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Solution

The correct option is A (b) and (c) both
Option (D) is correct. (b) and (c) both.

(b) $H_{2} - 2 S + [O] ⟶ H_{2} O + 0 S ↓$
(c) $2 + 5 H N O_{3} ⟶ H_{2} O + + 4 2 N O_{2} + [O]$

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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

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.

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. 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)

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:

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The correct option is A (b) and (c) bothOption (D) is correct. (b) and (c) both.(b) H2−2S+[O]⟶H2O+0S↓(c) 2+5HNO3⟶H2O++42NO2+[O]

The correct option is A (b) and (c) both
Option (D) is correct. (b) and (c) both.

(b) $H_{2} - 2 S + [O] ⟶ H_{2} O + 0 S ↓$
(c) $2 + 5 H N O_{3} ⟶ H_{2} O + + 4 2 N O_{2} + [O]$