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Standard XII

Chemistry

Interstitial Compounds

A black miner...

Question

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) : $N a [{A g (C N)}_{2}]$
(C) : $A g$
(D) : ${A g N O}_{3}$
(E) : $A g C l$ .
If true enter 1, else enter 0.

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Solution

A black mineral ${A g}_{2} S$ is soluble in $N a C N$ solution forming $N a [{A g (C N)}_{2}]$ .

$A g_{2} S + 4 N a C N \to N a_{2} S + 2 N a [A g (C N)_{2}]$

On adding $Z n$ into $N a [{A g (C N)}_{2}]$ , $A g$ metal is formed.

$Z n + 2 N a [A g (C N)_{2}] \to N a_{2} [Z n (C N)_{4}] + 2 A g ↓$

$A g$ metal on boiling with ${H N O}_{3}$ forms ${A g N O}_{3}$

$2 A g + 2 H N O_{3} \to 2 A g N O_{3} + H_{2}$

${A g N O}_{3}$ gives white ppt $A g C l$ with $N a C l$ soluble in ${N H}_{3}$ solution.

$A g N O_{3} + N a C l \to A g C l ↓ (w h i t e) + N a N O_{3}$

$A g C l + 2 N H_{3} \to [A g (N H_{3})_{2}] C l$

${A g}_{2} S$ can be obtained when ${A g N O}_{3}$ reacts with hypo.

$N a_{2} S_{2} O_{3} + 2 A g N O_{3} \to A g_{2} S_{2} O_{3} w h i t e w a t e r - -- \to A g_{2} S b l a c k + H_{2} S O_{4}$

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Similar questions

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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Q. 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

If true enter 1, else enter 0.

Q. Colourless solution of (A) gives white precipitate (B) with

A g N O_{3}

solution, soluble in aq.

N H_{3}

. (A) also gives white precipiatete (C) with NaOH soluble in excess of it forming (D). (D) gives white precipiate (E) with

H_{2} S

.(A), (B), (C), (D) and (E) are as follows.

(A) :

Z n C l_{2}

(B) :

A g C l

Z n (O H)_{2}

(D) :

N a_{2} Z n O_{2}

(E) :

Z n S

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)

is obtained.

(E)

turns black on standing.

Identify

(D)

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(E)

Q. If true enter 1, else enter 0.
(A) (black) + dil.

H C l △ ⟶ (B) (l)

+ (C)(g). gas (C) turns lead acetate paper black. (B) gives orange ppt (D) soluble in excess of KI forming (E). Above mentioned unknown compounds are (A) : HgS, (B) :

H g C l_{2}

, (C) :

H_{2} S

, (D) :

H g I_{2}

, (E) :

K_{2} H g I_{4}

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