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Stoichiometry

An aqueous so...

Question

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 $(X)$ .

X = C u S O_{2}

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X = C u S O_{3}

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X = C u S O_{4}

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None of these

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Solution

The correct option is C $X = C u S O_{4}$
Option (C) is correct.
(i) : Copper sulphate reacts with barium chloride to form white precipitate of barium sulphate.
$C u S O_{4} + B a C L_{2} ⟶ B a S O_{4} (w h i t e p p t) + C u C l_{2}$
White precipitate of $B a S O_{4}$ is insoluble in dilute $H C l$ .
(ii) : $2 C u S O_{4} + 4 K I ⟶ C u_{2} I_{2} ↓ (b r o w n c o l o r) + I_{2} + 2 K_{2} S O_{4}$
It turns white on addition of excess of hypo.
(iii) : Copper sulphate reacts with potassium ferrocyanide to obtain chocolate coloured precipitate of cupric ferrocyanide.
$2 C u S O_{4} + K_{4} [F e (C N)_{6}] ⟶ C u_{2} [F e (C N)_{6}] (c h o c o l a t e c o l o u r e d p r e c i p i t a t e) + 2 K_{2} S O_{4}$

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Similar questions

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 :

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.

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 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. The aqueous solution of an inorganic compound (X) gives white precipitate with

N H_{4} O H

which does not dissolve in excess of

N H_{4} O H

This aqueous solution also gives white precipitate with

A g N O_{3}

and the precipitate is soluble in dilute

H N O_{3}

. Here, (X) is :

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