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Byju's Answer

Standard XII

Chemistry

Nomenclature of Carbonyls

A gives white...

Question

(A) gives white ppt (B) with NaOH, but (B) dissolves in excess of NaOH forming (C). (C) gives white ppt (D) when $H_{2} S$ gas is passed into it. (A) also gives white ppt (E) with $B a C l_{2}$ . (E) is insoluble in conc. $H N O_{3}$ . Identify (A), (B), (C), (D) and (E).

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Solution

The compound (A) is $Z n S O_{4}$ .
It gives white ppt (B) of $Z n (O H)_{2}$ with NaOH,
$Z n S O_{4} + 2 N a O H \to Z n (O H)_{2} ↓ (w h i t h e p p t) + N a_{2} S O_{4}$
But (B) dissolves in excess of NaOH forming (C) which is $N a_{2} Z n O_{2}$ .
$Z n (O H_{2}) e x c e s s N a O H - ------- \to N a_{2} Z n O_{2}$
(C) gives white ppt (D) (ZnS) when $H_{2} S$ gas is passed into it.
$N a_{2} Z n O_{2} H_{2} S - - \to Z n S ↓ (w h i t e p p t)$
(A) also gives white ppt (E) with $B a C l_{2}$ .
$Z n S O_{4} + B a C l_{2} \to B a S O_{4} ↓ (w h i t e p p t) + Z n C l_{2}$
(E) $(B a S O_{4})$ is insoluble in conc. $H N O_{3}$ .
A
$Z n S O_{4}$
B
$Z n (O H)_{2}$
C
$N a_{2} Z n O_{2}$
D
$Z n S$
E
$B a S O_{4}$

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Similar questions

Q. Colourless salt (A) give white ppt (B) with NaOH; ppt (B) dissolves in excess of NaOH to form (C). On passing

H_{2} S

gas into (C) white ppt (D) appears. (A) also gives white ppt (E) with

A g N O_{3}

solution. What is (A)?

Q. (A) (colourless solution) gives white ppt (B) with NaOH solution but ppt dissolves in excess of NaOH forming (C). (C) does not give ppt with

H_{2} S

but on boiling with

N H_{4} C l

, white ppt (B) appears. (A) also gives yellow ppt with

A g N O_{3}

State True or False.

(A) is

A l B r_{3}

A black colored (insoluble in

H_{2} O

) solid A does not dissolve in

H N O_{3}

. Aqua regia can dissolve A forming B. B gives yellow precipitate C with

N a O H

. B also gives an orange ppt. D with

K I

. D dissolves in excess of

K I

forming E. E gives brown ppt. with

N H_{4}^{+}

salt in presence of

N a O H

. A is precipitated if

H_{2} S

gas is passed into the solution of B in

d i l . H C l

The compound C is :

Q. (A) gives white ppt with

A g N O_{3}

soluble in aq

N H_{3}

. (A) gives green ppt (B) with NaOH but ppt dissolves to yellow solution (C) when heated with

H_{2} O_{2}

. (C) gives yellow ppt (D) with

B a C l_{2}

.
According to above experiment complete the matrix.

Metal nitrate

(A)

on heating decomposes, leaving a residue

(B)

which goes into the solution with dil.

H C l

. The solution of

(B)

gives white ppt. with ammonium carbonate solution. Ppt.

C

dissolves in dil.

H C l

and solution is treated with potassium chromate to yellow ppt.

(D)

. Solution

V

with dil.

H_{2} S O_{4}

also gives white ppt.

(E)

insoluble in dil.

H C l

and nitric acid. Precipitate

(E)

is part of white pigment lithopone.

What is

(E)

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A	$Z n S O_{4}$
B	$Z n (O H)_{2}$
C	$N a_{2} Z n O_{2}$
D	$Z n S$
E	$B a S O_{4}$

(A) gives white ppt (B) with NaOH, but (B) dissolves in excess of NaOH forming (C). (C) gives white ppt (D) when H2S gas is passed into it. (A) also gives white ppt (E) with BaCl2. (E) is insoluble in conc. HNO3. Identify (A), (B), (C), (D) and (E).

(A) gives white ppt (B) with NaOH, but (B) dissolves in excess of NaOH forming (C). (C) gives white ppt (D) when $H_{2} S$ gas is passed into it. (A) also gives white ppt (E) with $B a C l_{2}$ . (E) is insoluble in conc. $H N O_{3}$ . Identify (A), (B), (C), (D) and (E).