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JEEMAIN and NEET
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NEET PAST PAPERS
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2012
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Q)
Aluminium is extracted from alumina
(
A
l
2
O
3
)
by electrolysis of a molten mixture of :
( A )
A
l
2
O
3
+
H
F
+
N
a
A
l
F
4
( B )
A
l
2
O
3
+
K
F
+
N
a
3
A
l
F
6
( C )
A
l
2
O
3
+
N
a
3
A
l
F
6
+
C
a
F
2
( D )
A
l
2
O
3
+
C
a
F
2
+
N
a
A
l
F
4
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