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JEEMAIN and NEET
>>
Chemistry
>>
p-Block Elements
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Q)
The formulae of ferric alum
(
a
)
(
N
H
4
)
2
S
O
4
F
e
2
(
S
O
4
)
3
(
b
)
(
N
H
3
)
2
S
O
4
F
e
(
S
O
2
)
3
(
c
)
(
N
H
2
)
3
S
O
3
F
e
2
(
S
O
2
)
3
(
d
)
(
N
H
4
)
2
S
O
3
F
e
2
(
S
O
3
)
2
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