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Byju's Answer

Standard XII

Chemistry

Oxides and Oxoanions

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 $C u S O_{4}$ 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 :

S O_{2}

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N H_{3}

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N O_{2}

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N_{2} O

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Solution

The correct option is B $N H_{3}$
Option (B) is correct.
The gas X will be $N H_{3}$ .
(i) Ammonia gas turns red litmus blue thus it is basic in nature.
(ii) Ammonia reacts with copper sulphate to form deep blue coloured complex $[C u (N H_{3})_{4}] S O_{4}$ .
$C u S O_{4} + 4 N H 3 ⟶ [C u (N H_{3})_{4}] S O_{4} (d e e p b l u e c o l o u r)$
(iii) Ammonia reacts with ferric chloride to form brown ppt of ferric hydroxide.
$F e C l_{3} + N H_{3} + H_{2} O ⟶ F e (O H)_{3} [b r o w n p p t] + N H_{4} C l$
Brown precipitate of ferric hydroxide is soluble in dilute $H N O_{3}$ .

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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 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).

Q. When an aqueous solution of gas

(X)

is added to

F e C l_{3}

solution, a brown precipitate is obtained which is soluble in dil.

H N O_{3}

, gas

(X)

will give white fumes with

H C l

, then gas

(X)

is :

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. 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 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)

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An aqueous solution of a gas (X) shows the following reactions.(i) It turns red litmus blue.(ii) When added in excess to a CuSO4 solution, a deep blue colour is obtained.(iii) On addition of FeCl3 solution, a brown precipitate soluble in dilute HNO3 is obtained.Then the gas (X) will be :