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Hydrides of Group 16

A certain met...

Question

A certain metal (A) is boiled in dilute nitric acid to give a salt (B) and an oxide of nitrogen (C). An aqueous solution of (B) with brine gives a precipitate (D) which is soluble in ammonium hydroxide. On adding aqueous solution of (B) to hypo solution, a white precipitate (E) is obtained. (E) on standing turns to a black compound.Compound (A) to (F) are identified as:
(A) : $A g$ ; (B) : $A g N O_{3}$ , (C) : $N O_{2}$ , (D) : $A g C l$ , (E) : $A g_{2} S_{2} O_{3}$ and (F) : $A g_{2} S$
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Solution

When silver metal (compound A) is boiled in dilute nitric acid, it forms silver nitrate (compound B) and nitrogen dioxide gas (compound C).
$A g + 2 H N O_{3} b o i l - - \to A g N O_{3} + N O_{2} + H_{2} O$
Silver nitrate reacts with NaCl to form white precipitate of silver chloride (compound D) which dissolves in ammonium hydroxide.
$A g N O_{3} + N a C l \to N a N O_{3} A g C l ↓ w h i t e$
Silver nitrate reacts with hypo solution to form a white precipitate of $A g_{2} S_{2} O_{3}$ which is compound .
$2 A g N O_{3} + N a_{2} S_{2} O_{3} \to A g_{2} S_{2} O_{3} ↓ w h i t e + 2 n a N O_{3}$
On standing $A g_{2} S_{2} O_{3}$ turns to black $A g_{2} S$ which is compound F.
$A g_{2} S_{2} O_{3} + H_{2} O \to A g_{2} S ↓ b l a c k + H_{2} S O_{4}$

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Similar questions

Q. A certain metal

(A)

is boiled in dilute

H N O_{3}

to give a salt

(B)

and an oxide of nitrogen

(C)

. An aqueous solution of

(B)

with brine gives a precipitate

(D)

which is soluble in

N H_{4} O H

. On adding aqueous solution of

(B)

to hypo solution, a white precipitate

(E)

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(E)

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Identify

(D)

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Q. A black mineral (A) is soluble in

N a C l

solution forming (B). On adding

Z n

into (B), metal (C) is formed. Metal (C) on boiling with

{H N O}_{3}

forms (D) which gives white ppt (E) with

N a C l

soluble in

{N H}_{3}

solution. (A) can be obtained when (D) reacts with hypo. (A) to (E) are
(A) :

{A g}_{2} S

(B) :

N a [{A g (C N)}_{2}]

A g

(D) :

{A g N O}_{3}

(E) :

A g C l

.
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Q. Aqueous solution of A can dissolve

A g B r

forming a soluble complex B. A also reacts with aqueous

{A g N O}_{3}

solution giving white ppt. C changing to black ppt D. (A) is the hypo solution

(N a_{2} S_{2} O_{3})

, (B) is

N a_{3} [A g (S_{2} O_{3})_{2}]

, (C) is

A g_{2} S_{2} O_{3}

and (D) is

A g_{2} S

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If true enter 1, else enter 0.

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)

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(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)

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H N O_{3}

is obtained. Identify

(G)

and

(H)

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}]

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B a C l_{2}

to an aqueous solution of E, a white ppt insoluble in

H N O_{3}

is obtained.

Identify B.

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