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JEEMAIN and NEET
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Chemistry
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General Principals and Processes of Isolation of Metals
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Q)
Iron is rendxred passive by treatment with concentrated
(
a
)
H
C
l
(
b
)
H
N
O
3
(
c
)
H
3
P
O
4
(
d
)
H
2
S
O
4
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