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1336
In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because
A.
it makes bauxite a better conductor of electricity
B.
it makes bauxite melt at a lower temperature
C.
it makes aluminium purer
D.
it prevents aluminium from getting oxidized
E.
it protects the carbon electrodes used in the process
View Answer & Discuss (12)
JAMB 1979
1337
In the redox reaction\( 2Fe^{2+} + CI_2 → 2Fe^{3+} + 2Cl^-\)
A.
Cl
2
is reduced because it has lost electrons
B.
Cl
2
is reduced because its oxidation number has decreased
C.
Cl
2
is reduced because its molecule is change to two ions
D.
Fe
2+
is reduced because it has lost electrons
E.
Fe
2+
is reduced because it has gained electrons
View Answer & Discuss (8)
JAMB 1979
1338
An anhydride is?
A.
a compound wich has no water of crystallization
B.
an oxide whose solution in water has a PH greater than 7
C.
an oxide whose solution in water has a PH less than 7
D.
an oxide that has hydrogen atoms
E.
an amphoteric oxide
View Answer & Discuss (23)
JAMB 1979
1339
In which of the following reactions is sulphur dioxide acting as an oxidizing agent?
A.
SO
2
+ 2HNO
3
→H
2
SO
4
+ NO
2
+ Heat
B.
2SO
2
+ 2H
2
O + O
2
→ 2H
2
SO
4
C.
SO
2
+ 2H
2
O + CI
2
→ H
2
SO
4
+ 2HCI
D.
SO
2
+ 2H
2
S → 3S + 2H
2
O
E.
SO
2
+ H
2
O → H
2
SO
3
View Answer & Discuss (4)
JAMB 1979
1340
Calcium hydroxide and ammonium chloride when heated together will give an important product. This compound may be obtained dry by
A.
dissolving it in water, recrystallizing it and then drying in the oven
B.
passing it through a concentrated aqueous solution of sodium hydroxide
C.
passing it through calcium oxide
D.
passing it through concentrated sulphuric acid
E.
passing it through anhydrous calcium choride
View Answer & Discuss (9)
JAMB 1979
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