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Standard X
Chemistry
Prevention of Corrosion
Chemically ru...
Question
Chemically rust is:
A
hydrated ferrous oxide.
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B
hydrated ferric oxide.
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C
only ferric oxide.
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D
none of these.
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Solution
The correct option is
B
hydrated ferric oxide.
Chemical formula of rust is
F
e
2
O
3
.
X
H
2
O
→
Hydrated Ferric oxide
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Assertion :Zinc is used for galvanising iron. Reason: Rust is hydrated ferric oxide.
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Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.
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Assertion :Both ferrous and ferric ions are present in 3rd group. Reason: Both ferrous and ferric ions have same solubility product.
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Q.
1
m
o
l
of iron
(
F
e
)
reacts competely with
0.65
m
o
l
O
2
to give a mixture of only
F
e
O
and
F
e
2
O
3
. Mole ratio ferrous oxide to ferric oxide to ferric oxide is:
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