UNIVERSITY OF LAGOS POST-UTME PAST QUESTIONS 2008. CHEMISTRY

CHEMISTRY
UNIVERSITY OF LAGOS
2008


1. The densities of two gases, X and Y,
are 0.5gdm-3 and 2.0gdm-3 respectively.
What is the rate of diffusion of X relative to
Y ?
A. 0.1
B. 0.5
C. 2.0
D. 4.0

2. Which statements are correct for the
neutralization of a strong alkali in aqeous
solution at 250C ?
A. It is an endothermic process
B. It can be represented as H3O+(aq) + OH(aq)
--> 2H2O(|)
C. The enthaply change per mole of H2O
formed is independent of the acid or alkali
used
D. It is esterification process

3. Which of the following is an ore of tin?
A. siderite
B. haematite
C. magnetite
D. cassiterite

4. An elimination reacton occurs when ethane
is converted to
A. 1,2-dibromoethane
B. ethanol
C. ethene
D. ethylethanoate

5. Argon is used in a gas-filled electric lamps
because it helps to
A. prevent the reduction of the lamp
filaments
B. prevent oxidation of the lamp
filament
C. make the lamp filament grow brightly
D. keep the atmosphere in the lamp
inert.

6. The nmber of hydrogen ions in 4.9g of
tetraoxosulphate(VI)acid is
A. 3.01 x 1022
B. 6.02 x 1022
C. 3.01 x 1023
D. 6.02 x 1023

7. Which of the following is the correct order of
decreasing activity of the metals Fe, Ca, Al
and Na ?
A. Fe > Ca > Al > Na
B. Na > Ca > Al > Fe
C. Al > Fe > Na > Ca
D. Ca > Na > Fe > Al

8. CH3CH-CH2-CH-CH2-CH3
| |
CH 3 CH3
The IUPAC nomenclature for the compound
above is
A. Dimethylhexane
B. 3,5-dimethylhexane
C. 1,1-dimethyl, 3-methylpropane
D. 2,4-dimethylhexane

9. 10g of a solid is in equilibrum with its own
vapour, when 1g of s small amount of solid
is added, the vapour pressure.
A. remains the same
B. drops
C. increases by 1%
D. increases by 90%

10. Which of the these salts will produce its
metal, oxygen and nitrogen(IV)oxide on
heating ?
A. Silver trioxonitrate(V)
B. Sodiumtrioxonitrate(V)
C. Calcium trioxonitrate(V)
D. Lithium trioxonitrate(V)

11. Chromatography is used to seprate
components of mixture which differ in their
rates of
A. diffusion
B. migration
C. reaction
D. sedimentation

12. At the same temperature and pressure,
50cm3 of nitrogen gas contains the same
number of molecules as
A. 25cm3 of methane
B. 40cm3 of hydrogen
C. 50cm3 of ammonia
D. 100cm3 of chlorine

13. What is the product when propan-2-ol is
oxidized with cold dilute potassium
manganate(VII)
A. CH3CH(OH)CH2OH
B. CH3CH2CH2OH
C. CH3CH2CHO
D. CH3COCH3

14. If an element R belongs to the same group
as sodium, an aqeous solution of ROH will be
A. neutral
B. acidic
C. coloured
D. have pH greater than 7

15. NH3 + H3O+ --> NH4+ + H2O
It may be deduced from the reaction above
that
A. A redox reaction has occured
B. H3O+ acts as an oxidizing agent
C. H3O+ acts as an acid
D. Water acts as an acid

16. Sodium chloride has no solubility product
value because od
A. saline nature
B. high solubility
C. solubility
D. insolubility

17. An anhydride is an oxide of a non-metal
A. which will not dissolve in water
B. whose solution in water has a pH
greater than 7
C. whose solution in water has a pH less
than 7
D. whose solution in water has a pH of 7

18. In the oil drop experiment, Millikan
determined the
A. charge to mass of the electron
B. mass of the electron
C. charge of the electron
D. mass of the proton

19. The carbon atoms on ethane are
A. Sp2 hybridized
B. Sp3 hybridized
C. Sp2d hybridized
D. sp hybridized

20. An example of a secondary amine is
A. propylene
B. di-butilamine
C. methylamine
D. trimethylamine


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