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Byju's Answer
Standard XII
Chemistry
Polyhalogen Compounds
a green colou...
Question
a green colour salt a on heating forms white colour substance b which on further heating gives out gases c and d having a pungent smell. identify the 4 compounds and wrthe the equation
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Solution
D
e
a
r
S
t
u
d
e
n
t
G
r
e
e
n
c
o
l
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r
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d
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i
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e
.
,
F
e
S
O
4
.
7
H
2
O
O
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h
e
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t
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f
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r
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p
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a
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.
O
n
f
u
r
t
h
e
r
h
e
a
t
i
n
g
,
i
t
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v
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s
F
e
2
O
3
a
n
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w
o
g
a
s
e
s
r
e
l
e
a
s
e
d
a
r
e
S
O
2
a
n
d
S
O
3
.
R
e
a
c
t
i
o
n
:
F
e
S
O
4
.
7
H
2
O
→
H
e
a
t
F
e
S
O
4
F
e
S
O
4
→
H
e
a
t
F
e
2
O
3
+
S
O
2
+
S
O
3
H
e
n
c
e
,
A
=
F
e
S
O
4
.
7
H
2
O
B
=
F
e
S
O
4
C
a
n
d
D
=
S
O
2
a
n
d
S
O
3
R
e
g
a
r
d
s
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Similar questions
Q.
When a mineral (A) is boiled with
N
a
2
C
O
3
. A white precipitate (B) is formed. The precipitate is filtered and
C
O
2
is passed through the filtrate, then a compound (C) sparingly soluble in cold water is formed. The compound (C) on strong heating gave two compounds D and E on heating with cobalt oxide produces blue coloured substance (F). Identify A to F and give balanced chemical reactions
Q.
An inorganic red coloured compound (A) on heating gives a compound (B) and a gas (C). (A) on treatment with conc.
H
N
O
3
gives compound (D), brown colour substance (E) and a neutral oxide (F). Compound (D) on warming gives off again gas (C). Then A, will be:
Q.
An orange coloured solid
(
A
)
is soluble in water and gives a gas
(
B
)
and green coloured solid
(
C
)
on heating. The compound
(
A
)
gives a gas
(
D
)
when reacts with
N
a
O
H
and solution turns yellow. The gas
(
D
)
turns red litmus blue. Identify the compounds
(
A
)
to
(
D
)
and explain the reaction.
Q.
On heating green coloured ferrous sulphate crystals, a reddish brown solid is left out and the smell of a gas having the odour of burning sulphur is obtained. Identify the type of reaction involved.
Q.
A hydrated metallic salt (A) , light green in colour gives a white anhydrous residue (B) after being heated gradually. (B) is soluble in water and its aqueous solution reacts with NO to give a dark brown compound (C). (B) on strong heating gives a brown residue (D) and a mixture of two gases (E) and (F). The gaseous mixture , when passed through acidified permanganate, discharged the pink colour and when passed through acidified
B
a
C
l
2
solution, gives a white precipitate. Compounds (A), (B), (C) , (D) , (E) and (F) are identified as:
(A) :
F
e
S
O
4
.
7
H
2
O
(B) :
F
e
S
O
4
,(C) :
F
e
S
O
4
.
N
O
o
r
[
F
e
(
H
2
O
)
6
N
O
]
S
O
4
]
, (D) :
F
e
2
O
3
,(E) :
S
O
2
and (F) :
S
O
3
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