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Byju's Answer
Standard XII
Chemistry
Ores and Minerals
Which mineral...
Question
Which mineral has been named incorrectly?
A
Bauxite :
A
l
2
O
3
⋅
2
H
2
O
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B
Corundum :
A
l
2
O
3
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C
Cryolite :
3
N
a
F
⋅
A
l
F
3
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D
Feldspar :
B
e
3
A
l
2
S
i
5
O
18
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Solution
The correct option is
D
Feldspar :
B
e
3
A
l
2
S
i
5
O
18
Feldspar is
K
A
l
S
i
3
O
8
.
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Similar questions
Q.
Assertion :In the electrolytic reduction of
A
l
2
O
3
cryolite is used. Reason: Cryolite is an ore of aluminium.
Q.
Assertion :Cryolite is employed in the extraction of aluminium. Reason: Cryolite lowers the melting point of
A
l
2
O
3
.
Q.
Cryolite and fluorspar are mixed with
A
l
2
O
3
during electrolysis for extraction of aluminum to _______.
Q.
Cryolite,
N
a
3
A
l
F
6
is added to
A
l
2
O
3
in Hall-Heroult process to ____ m.p. and to ___________ electrical conductivity.
Q.
The major role of fluorspar which is added in small amount in the electrolytic reduction of
A
l
2
O
3
dissolved in fused cryolite is :
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