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Chemistry
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Q)
Aluminium metal becomes passive in :
(
1
)
c
o
n
c
.
H
N
O
3
(
2
)
d
i
l
.
H
2
S
O
4
(
3
)
v
e
r
y
d
i
l
.
H
N
O
3
(
4
)
c
o
n
c
.
H
2
S
O
4
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