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Reactivity with Halogens and Hydrogen (Group 2)

A sulphide or...

Question

A sulphide ore (A) on roasting leaves a residue (B). (B) on heating with chlorine gives (C), soluble in water, addition of excess potassium iodide to a solution of (C) gives a solution (D). A brown precipitate (E) is formed when a solution of ammonium sulphate is added to an alkaline solution of (D). Identify (E).

A

K_{2} H g I_{4}

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B

H g C l_{2}

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C

H g O

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D

H g O . H g (N H_{2}) I

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Solution

The correct option is D $H g O . H g (N H_{2}) I$

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Similar questions

Q. A colorless sait

(X)

is soluble in water and also in alcohol and amines. On strong heating,

(X)

gives a brown gas

(Y)

and a grey residue.

(X)

dissolves in ammonia to give a solution

(Z)

which gives silver mirror with aldehydes. A solution of

(X)

is easily reduced by iron(II) sulphate. A solution of

(X)

also gives a brick red precipitate with potassium dichromate solution. Hence,choose the correct alternative :

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}

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

A colorless solid (A), when placed into water, produces heavy white turbidity to (B). Solid (A) gives a clear solution in

c o n c . H C l

H C l

solution is added to large amounts of water, (B) forms again. (B) dissolves in dilute HCl. When

H_{2} S

is passed through a suspension of (A) or (B); a black precipitate (C) forms, (C) is insoluble in yellow ammonium sulphide

(N H_{4})_{2} S

C o n c . H_{2} S O_{4}

added to solid (A) liberates gas (D). Gas(D) is water-soluble and gives white precipitate with mercuric salts (E) and not mercuric salts. The black precipitate (C) dissolves in

H N O_{3}

(1:1) to give a solution to which

H_{2} S O_{4}

is added followed by addition of

N H_{4} O H

when a white precipitate (F) is formed. (E) gives a black ppt. (G) with a solution of sodium stannite.

Compound B is not soluble in:

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

X

.

Q. Precipitate 'A' from group II analysis is dissolved in ammonium sulphide solution to give a yellow solution 'B'. Dil. HCl is added to solution 'B' to get a yellow precipitate 'C'. 'C' dissolves in concentrated

H N O_{3}

to form a acidic solution which gives a canary yellow precipitate on heating with ammonium molybdate. Precipitate 'C' is

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