🧪 1992

JAMB Chemistry 1992 past questions

51 questions from the 1992 JAMB UTME Chemistry paper. Free, with answers where available.

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Chemistry JAMB 1992 Q1 ✓ Answer: C
Which of the following substances is not a homogeneous mixture?
A
Filtered sea water
B
Soft drink
C
Flood water
D
Writing ink
Chemistry JAMB 1992 Q1 ✓ Answer: B
The dissolution of common salt in water is physical change because
A
the salt can be obtained by crystallization
B
the salt can be recovered by the evaporation of water.
C
Heat is not generated during mixing
D
The solution will not boil at 100oC
Chemistry JAMB 1992 Q2 ✓ Answer: C
There is a large temperature interval between the melting point and the boiling point of a metal because.
A
metals have very high melting points
B
metals conduct heat very rapidly
C
melting does not break the metallic bond but boiling does.
D
the crystal lattice of metals is easily broken.
Chemistry JAMB 1992 Q2 ✓ Answer: B
Which of the following substances is mixture?
A
Sulphur powder
B
Bronze
C
Distilled water
D
Ethanol
Chemistry JAMB 1992 Q3 ✓ Answer: B
How many moles of [H+] are there in 1 dm3 of 0.5 solution of H2SO4
A
2.0 moles
B
1.0 mole
C
0.5 mole
D
0.25 mole
Chemistry JAMB 1992 Q3 ✓ Answer: C
How many moles of oxygen molecules would be produced dfrom the decompostition of 2.5 moles of potassium trioxochlorate (V)?
A
2.50
B
3.50
C
3.75
D
7.50
Chemistry JAMB 1992 Q4 ✓ Answer: C
wH2SO4 + xA(OH)3 yH2O + zAl2(SO4)3. The respective values of w, x, y and z in the equation above are
A
2,2,5 and 1
B
3,2,5and 2
C
3,2,6 and 1
D
2,2,6 and 2
Chemistry JAMB 1992 Q5 ✓ Answer: A
At 25oC and 1 atm, a gas occupies a volume of 1.50 dm3. What volume will it occupy at 100oC at 1 atm?
A
1.88 dm3
B
6.00 dm3
C
18.80 dm3
D
60.00 dm3
Chemistry JAMB 1992 Q6 ✓ Answer: C
If 100 cm3 of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is
A
10.0 s
B
12.5 s
C
17.7 s
D
32.0 s [ O = 16, H = 1]
Chemistry JAMB 1992 Q7 ✓ Answer: D
Which of the following is a measure of the average kinetic energy of the molecules of a substance.
A
Volume
B
Mass
C
Pressure
D
Temperature An increase in temperature causes an increase in the pressure of a gas in a fixed volume due to an increase in the
Chemistry JAMB 1992 Q8 ✓ Answer: D
For iodine crystals to sublime on heating, the molecules must acquire energy that is
A
less than the forces of attraction in the solid
B
equal to the forces of attraction in the solid
C
necessary to melt the solid Chemistry 1993
D
greater than the forces of attraction in both solid and the liquid phases
Chemistry JAMB 1992 Q9 ✓ Answer: D
The nucleus of the isotope tritium, contains
A
two neutrons with no protons
B
one neutron and one proton
C
two neutron and one electron
D
two neutron, one proton, and one electron.
Chemistry JAMB 1992 Q11 ✓ Answer: B
14 N + X 17 8 O + 1 1 H . In the above reaction , X is a
A
neutron,
B
Helium atom
C
Lithium atom
D
Deutrium atom
Chemistry JAMB 1992 Q11 ✓ Answer: B
Nature of solute 11. Temperature. 1V.Pressure.
A
l, ll, lll and lV
B
l and ll only
C
ll only
D
l, lll and iV only [PAGE 35]
Chemistry JAMB 1992 Q12 ✓ Answer: D
Four elements P,Q,R and S have 1,2,3 and 7 electrons in their outermost shells respectively. The element which is unlikely to be a metal is
A
P
B
Q
C
R
D
S
Chemistry JAMB 1992 Q13 ✓ Answer: A
The pollutants that are likely to be present in an industrial environment are
A
H2S, SO2 and oxides of nitrogen
B
NH3, HCl and CO
C
CO2 NH3 and H2S
D
Dust, No and Cl2
Chemistry JAMB 1992 Q14 ✓ Answer: D
Which of the following gases dissolves in water vapour to produce acid rain during rainfall?
A
Oxygen
B
Carbon (11) oxide
C
Nitrogen
D
Sulphur (lV) oxide
Chemistry JAMB 1992 Q15 ✓ Answer: B
Water for town supply is chlorinate to make it free from
A
bad odour
B
bacteria
C
temporary hardness
D
permanent hardness.
Chemistry JAMB 1992 Q17 ✓ Answer: C
An emulsion paint consist of
A
gas or liquid particles dispersed in liquid
B
liquid particles dispersed in liquid
C
solid particles dispersed in liquid
D
solid particles dispersed in solid
Chemistry JAMB 1992 Q19 ✓ Answer: C
Arrange HCl, CH3 COOH, C6H5CH3 in order of increasing conductivity.
A
HCl,CH3 COOH,C6H5CH3
B
C6H5CH3 HCl, CH3, COOH
C
C6H5CH3 COOH, HCl,
D
CH3, COOH, C6H5CH3,HCl
Chemistry JAMB 1992 Q20 ✓ Answer: C
Which of these is an acid salt?
A
K2SO4 Al2(SO4)3.24H2O
B
CuCO3.Cu(OH)2
C
NaHS
D
CaOCl2
Chemistry JAMB 1992 Q21 ✓ Answer: B
How many grams of H2SO4 are necessary for the preparation of 0.175 dm3 of 6.00 M H2SO4?
A
206.0 g
B
103.0 g
C
98.1 g
D
51.5 g [S = 32.06, O = 16.00, H = 1.00].
Chemistry JAMB 1992 Q22 ✓ Answer: B
Copper (ll) tetraoxosulphate (lV) solution is electrolyzed using carbon electrodes. Which of the following are produced at the anode and cathode respectively.
A
Copper and oxygen
B
Oxygen and copper
C
Hydrogen and copper
D
Copper and hydrogen
Chemistry JAMB 1992 Q23 ✓ Answer: C
Calculate the mass, in kilograms, of magnesium produced by the electrolysis of magnesium(ll) chloride in a cell operating for 24 hours at 500 amperes.
A
2.7
B
5.4
C
10.8
D
21.7 [Faraday = 96,500 C mmol-1, Mg = 24]
Chemistry JAMB 1992 Q24 ✓ Answer: D
MnO2 + 2Cl- + 4H Mn2+ +Cl2 + 2H2O. The change is oxidation numbers when the manganese, chlorine and hydrogen ions react according to the above equation are respectively.
A
2, 2, 4
B
–1,-2 4
C
–2, 1, 0
D
2, 4, 0
Chemistry JAMB 1992 Q25 ✓ Answer: B
S2O32- + l2 S4O62- + 21. In the reaction above, the oxidizing agents is
A
S2O32-
B
l2
C
S4O62-
D
l-
Chemistry JAMB 1992 Q26 ✓ Answer: A
In which of the following is the entropy change positive?
A
H2O(l) H2O(g)
B
Cu2+ (aq) + Fe(s) Fe2+ (aq)+Cu(s)
C
N2(g) + 3H2(g 2NH3(g)
D
2HCl(s) N2(g) + Cl2(g)
Chemistry JAMB 1992 Q27 ✓ Answer: B
In what way is equilibrium constant for the forward reaction related to that that of the reverse reaction?
A
The addition of the two is expected to be one
B
The product of the two is expected to be one
C
The two equilibrium constants are identical
D
The product of the two is always greater than one.
Chemistry JAMB 1992 Q28 ✓ Answer: A
Which of the following equilibra shows little or no net reaction when the volume of the volume of the system is decreased?
A
H2(g) + l2(g 2Hl(g)
B
2NO2(g N2O4(g)
C
PCl5( PCl3(g) + Cl2(g)
D
ZnO(s) + CO2(g ZnCO3(s)
Chemistry JAMB 1992 Q29 ✓ Answer: C
For a general equation of the nature xP + yQ mR + nS, the expression for the equilibrium constant is
A
k [P]x [Q]y
B
[P]x [Q]y [R]m [S]n
C
[R]m [S]n [P]x [Q]y
D
m [R] n [S] X [P] y [Q].
Chemistry JAMB 1992 Q30 ✓ Answer: D
Which of these statements is TRUE about carbon(1V)oxide?
A
It supports combustion
B
It is strong acidic in water
C
It is very soluble in water
D
It supports the burning of magnesium to produce magnesium oxide.
Chemistry JAMB 1992 Q31 ✓ Answer: A
In the experiment above, Z can be
A
a solution of sodium dioxonitrate(lll) and ammonium chloride
B
a solution of lead trioxonitrate(V) [PAGE 36]
C
a solution of sodium trioxonitrate(V) and ammonium chloride
D
concentrated tetraoxosulphate (Vl) acid and sodium trioxonitrate(V).
Chemistry JAMB 1992 Q32 ✓ Answer: C
Which of the following combination of gases is used for metal welding? 1. Oxygen and ethyne. ll Hydrogen and ethyne. 1ll. Hydrogen and oxygen. 1V Ethyne, hydrogen and oxygen.
A
1 and 11
B
111 and 1V
C
1 and 111
D
11 and 1V
Chemistry JAMB 1992 Q33 ✓ Answer: D
Which of the following oxides of nitrogen is unstable in air?
A
NO2
B
NO
C
N2O4
D
N2O5
Chemistry JAMB 1992 Q34 ✓ Answer: D
The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is
A
hydrogen
B
nitrogen(1V) oxide
C
oxygen
D
ammonia
Chemistry JAMB 1992 Q35 ✓ Answer: D
Safety matches contain sulphur and
A
Potassium trioxochlorate(V)
B
Potassium trioxonitrate (V)
C
Charcoal
D
Phosphorus sulpide
Chemistry JAMB 1992 Q36 ✓ Answer: B
Addition of an aqueous solution of barium chloride to the aqueous solution of a salt gives a white precipate.
A
nitrate
B
carbonate
C
chloride
D
sulphide
Chemistry JAMB 1992 Q37 ✓ Answer: D
Sodium hydroxide solution can be conveniently stored in a container made of
A
lead
B
zinc
C
aluminum
D
copper
Chemistry JAMB 1992 Q38 ✓ Answer: D
Which of the following is NOT used as raw material in the solvary process?
A
Ammonia
B
Sodium chloride
C
Calcium trioxocarbonate
D
Sodium trioxocarbonate(V1)
Chemistry JAMB 1992 Q39 ✓ Answer: D
Duralumin consists of aluminum, copper,
A
zinc and gold
B
lead and manganese
C
nickel and silver
D
manganese and magnesium.
Chemistry JAMB 1992 Q40 ✓ Answer: B
CaO(s) + H2O(l ) Ca(OH)2(s) H = -65kJ. The process represented by the above equation is known as.
A
dissolution
B
slackin
C
liming
D
mortaring
Chemistry JAMB 1992 Q41 ✓ Answer: A
The carbon atoms in ethane are
A
sp3 hybridized
B
sp hybridized
C
sp2 hybridized
D
not hybridized.
Chemistry JAMB 1992 Q42 ✓ Answer: C
CH3 CH3¯C = CH¯CH 2¯CH¯ CH 3 CH2 CH3 The IUPAC name for the hydrocarbon above is
A
2-ethyl-5-methylhex-2-ene
B
2, 5-dimethylhex-2-ene
C
3,5-dimethylhept-3-ene
D
3,6-dimethylhexpt –3-ene
Chemistry JAMB 1992 Q43 ✓ Answer: A
Which of the following compounds is a secondary alkanol?
A
CH3¯ CH 2¯CH¯ CH 3 OH
C
CH3 CH2 CH2 CH2 OH
D
CH3 CH2 OCH2 CH3 CH3 CH3¯ C¯OH CH3
Chemistry JAMB 1992 Q44 ✓ Answer: A
Which of the following compounds reacts with sodium metals as well as silver and copper salt.
A
CH3 Ca = C ¯CH 3 B CH3 CH2 CH2 CH2 CH3
C
CH3 Ca CH3
D
CH3 CH CH CH3
Chemistry JAMB 1992 Q45 ✓ Answer: A
Which of the following are isomers?
A
Ethanol and dimethyl ether
B
Benzene and methylbenzene
C
Ethanol and propanone
D
Trichloromethane and tetrachloromehane
Chemistry JAMB 1992 Q46 ✓ Answer: D
The function group present in an treatment with a saturated solution of NaHCO3 is .
A
hydroxyl group
B
carbonalkoxyl group
C
carbonyl group
D
carboxy group.
Chemistry JAMB 1992 Q47 ✓ Answer: C
The characteristic reaction of carbonyl compounds is.
A
Substitution
B
Elimination
C
Addition
D
Saponificatioon
Chemistry JAMB 1992 Q48 ✓ Answer: C
An organic compound containing 40.1% carbon and 6.667% hydrogen has an empirical formula of .
A
C2H4O2
B
C2H3O2
C
CH2O
D
CH3O
Chemistry JAMB 1992 Q49 ✓ Answer: D
Alkanals can be differentiated from alkanones by reaction with.
A
2,4-dinitrophenlhydrazine
B
hydrogen cyanide
C
sodium hydrogen sulphite
D
tollen’s reagent.
Chemistry JAMB 1992 Q50 ✓ Answer: D
An example of a polysaccharide is
A
dextrose
B
mannose C.glucose
D
starch. [PAGE 37]