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Byju's Answer

Standard XII

Chemistry

Introduction to Oxidation and Reduction

In qualitativ...

Question

In qualitative analysis when $H_{2} S$ is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. $H N O_{3}$ it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives._____.

deep blue precipitate of

C u (O H)_{2}

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deep blue solution of

[C u (N H_{3})_{4}]^{2 +}

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deep blue solution of

C u (N O_{3})_{2}

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deep blue solution of

C u (O H)_{2}

C u (N O_{3})_{2}

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Solution

The correct option is A deep blue solution of $[C u (N H_{3})_{4}]^{2 +}$
In qualitative analysis when $H_{2} S$ is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. $H N O_{3}$ it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives deep blue solution of $[C u (N H_{3})_{4}]^{2 +}$
Hence option B is correct.

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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)

Q. Aqueous solution of light greenish crystalline compound reacts with potassium ferricyanide to give a deep blue coloured solution or precipitate. Its chemical formula is:

Q. An aqueous blue coloured solution of a transition metal sulphate reacts with

H_{2} S

to give a black precipitate. The black precipitate dissolves in

50 %

nitric acid forming a blue coloured solution. The blue solution on treatment with

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in weekly acidic medium turns yellow brown and produce a white precipitate. The cation of blue coloured solution is :

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. 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 :

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In qualitative analysis when H2S is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. HNO3 it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives._____.