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Byju's Answer

Standard XII

Chemistry

Nitrogen

An aqueous so...

Question

An aqueous solution of a gas (X) shows the following reactions :
(i) It turns red litmus blue
(ii) When added in excess to a copper sulphate solution, a deep blue colour is obtained.
(iii) On addition to a ferric chloride solution, a brown precipitate, soluble in dilute nitric acid, is obtained.
Identify (X).

S O_{2}

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C O_{2}

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N H_{3}

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None of these

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Solution

The correct option is C $N H_{3}$
(a)The gaseous compound (X) is $N H_{3}$ .

(i) An aqueous solution of ammonia is called ammonium hydroxide. It is formed by dissolving ammonia in water. In aqueous solution ammonia deprotonates water to give ammonium ions and hydroxide ions. Hence converts the red litmus blue.

(ii) Ammonia reacts with copper sulphate to form deep blue complex $[C u (N H_{3})_{4}] S O_{4}]$ .
$C u S O_{4} + 4 N H_{3} ⟶ [C u (N H_{3})_{4}] S O_{4} d e e p b l u e$

(iii) Ferric chloride reacts with ammonium hydroxide to form water soluble ferric hydroxide.
$F e C l_{3} + 3 N H_{4} O H (a q) ⟶ F e (O H)_{3} s o l u b l e + 3 N H_{4} C l$

Ferric hydroxide reacts with nitric acid to form water soluble ferric nitrate.
$F e (O H)_{3} + 3 H N O_{3} ⟶ F e (N O_{3})_{3} + 3 H_{2} O s o l u b l e$

Option C is correct.

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Similar questions

Q. An aqueous solution of a gas

(X)

shows the following reactions.
(i) It turns red litmus blue.
(ii) When added in excess to a

C u S O_{4}

solution, a deep blue colour is obtained.
(iii) On addition of

F e C l_{3}

solution, a brown precipitate soluble in dilute

H N O_{3}

is obtained.
Then the gas

(X)

will be :

Q. A metal chloride

X

shows the following reactions.
(i) When

H_{2} S

is passed in an acidified aqueous solution of

X

, a black precipitate is obtained
(ii) The precipitate obtained at step (i) is not soluble in yellow ammonium sulphide.
(iii) When a solution of stannous chloride is added to an aqueous solution of

X

, a white precipitate is obtained which turns grey on addition of more of stannous chloride.
(iv) When an aqueous solution of

K I

is added to an aqueous solution of (

X

), a red precipitate is obtained which dissolves on addition of excess of

K I

.
Identify

X

Q. When an aqueous solution of gas

(X)

is added in excess to a copper sulphate solution, a deep blue color is obtained, then gas is :

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)

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).

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