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BASIC CHEMISTRY
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Metals of the first transition series
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Introduction to the tetravalency of carbon
Alkanes: Homologous series in relation to physical properties
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Aromatic hydrocarbons e.g. benzene - structure, properties and uses
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1346
the vapour density of a gas may be defined as
A.
the mass of a unit volume of the gas compared to an equal volume of water vapour
B.
the mass of a unit volume of the gas compared to an equal volume of hydrogen
C.
the mass of a unit volume of the gas compared to an equal volume of oxygen
D.
the mass of a unit volume of the gas minus the vapour pressure of water
E.
two times the relative molecular mass of the gas
View Answer & Discuss (7)
JAMB 1979
1347
The reaction 3C(s) + 2Fe
2
O
3
(s) = 4Fe(s) + 3CO
2
(g): \(\Delta\)H =46.0 kJ is
A.
isothermic
B.
adiabatic
C.
isobaric
D.
endothermic
E.
exothermic
View Answer & Discuss (6)
JAMB 1979
1348
The solution of a sample in a tube will be identified as a chloride if it gives
A.
a white precipitate on addition of AgNO
3
and barium chloride solutions
B.
a white precipiate when acidified with HCI, and then AgNO
3
solution added
C.
a white precipitate when acidified with dilute HNO
3
and then AgNO
3
solution added
D.
a white precipitate when acidified with dilute H
2
SO
4
and then barium nitrate solution added
E.
a pungent smell of chlorine gas when dilute HCI and MnO
2
are added
View Answer & Discuss (9)
JAMB 1979
1349
Hydrogenation may be effected by
A.
the removal of hydrogen from an alkane in the presence of a catalyst
B.
the addition of hydrogen to an alkane in the presence of a catalyst
C.
the addition of hydrogen to an alkyne
D.
the removal of hydrogen from an alkyne
E.
the addition of hydrogen to an ethyl alcohol
View Answer & Discuss (20)
JAMB 1979
1350
Two metallic ions associated with hard water are
A.
copper and zinc
B.
magnesium and silver
C.
calcium and magnesium
D.
potassium and tin
E.
sodium and lead
View Answer & Discuss (2)
JAMB 1979
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