🧪 1987

JAMB Chemistry 1987 past questions

36 questions from the 1987 JAMB UTME Chemistry paper. Free, with answers where available.

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Chemistry JAMB 1987 Q9 ✓ Answer: A
The atomic numbers of two elements X and Y are 12 and 9 respectively. The bond in the compound formed between the atoms of these two elements is.
A
ionic
B
convalent
C
neutral
D
co-ordinate.
Chemistry JAMB 1987 Q10 ✓ Answer: B
An element Z, contained 90% of 16 Z and 10% of 18 8Z. Its relative atomic mass is
A
16.0
B
16.2
C
17.0
D
17.8
Chemistry JAMB 1987 Q11 ✓ Answer: B
The greater the difference in electronegativity between bonded atoms, the
A
lower the polarity of the bond
B
higher the polarity of the bond C weaker the bond
E
higher the possibility of the substance formed being a molecule.
Chemistry JAMB 1987 Q13 ✓ Answer: D
In the purification of town water supply, alum is used principally to .
A
kill bacteria
B
control the pH of water
C
improve the taste of the water
D
coagulate small particles of mud.
Chemistry JAMB 1987 Q14 ✓ Answer: D
Which of the following water samples will have the highest titer value wages titrated for the Ca2+ ions using soap solution?
A
Permanently hard water after boiling
B
Temporarily hard water after boiling
C
Rain water stored in a glass jar for two years
D
Permanently hard water passed through permutit
Chemistry JAMB 1987 Q15 ✓ Answer: B
Oil spillage in ponds and creeks can be cleaned up by
A
burning off the oil layer
B
spraying with detergent
C
dispersal with compressed air
D
spraying with hot water.
Chemistry JAMB 1987 Q16 ✓ Answer: C
The solubility of Na3AsO4(H2O)12 is 38.9 g per 100 g H2O. What is the percentage of Na3AsO4 in the saturated solution?
A
87.2%
B
38.9%
C
19.1%
D
13.7% [As = 75, Na = 23, O = 12, H= 1] [PAGE 18]
Chemistry JAMB 1987 Q17 ✓ Answer: A
Which is the correct set results for tests conducted respectively on fresh lime and ethanol? Test Fresh lime juice Ethanol
A
Add crystals of NaHCO3 Gas evolve No gas evolved
B
Test with methyl orange Turns colourless No change
C
Taste Bitter Sour
D
Add a piece of sodium No gas evolved H2 evolved
Chemistry JAMB 1987 Q18 ✓ Answer: C
In which of the following are the aqueous solutions of each of the substances correctly arranged in order of decreasing acidity?
A
Ethanoic acid, milk of magnesia, sodium chloride, hydrochloric acid and sodium hydroxide.
B
Ethanoic acid hydrochloric acid, milk of magnesiam sodium chloride and sodium, hydroxide.
C
Hydrochloric acid, ethanoid acid solution chloride, milk of magnesia and sodium hydroxide
D
Hydrochloric acid sodium hydroxide sodium chloride ethanoic acid and milk of magnesia
Chemistry JAMB 1987 Q20 ✓ Answer: A
If 24.83 cm3 of 0.15 M NaOH is tritrated to its end point with 39.45 cm3 of HCl, what is the molarity of the HCl ?
A
0.09 4 M
B
0.150 M
C
0.940 M
D
1.500 M
Chemistry JAMB 1987 Q22 ✓ Answer: C
Which of the following statements is CORRECT if 1 Faraday of electricity is passed through 1 M CuSO4 solution for 1 minute?
A
The pH of the solution at the cathode decreases
B
The pH of the solution at the anode decreases
C
1 mole of Cu will be liberated at the cathode
D
60 moles of Cu will be liberated at the anode.
Chemistry JAMB 1987 Q23 ✓ Answer: C
What mass of magnesium would be obtained by passing a current of 2 amperes for 2 hrs. 30mins through molten magnesium chloride?
A
1.12 g
B
2.00 g
C
2.24 g
D
4.48 g [1 faraday = 96500 coulombs, Mg = 24]
Chemistry JAMB 1987 Q24 ✓ Answer: C
In the reaction of 3CuO + 2NH3 3Cu + 3H2O + N2 how many electrons are transferred for each mole to copper produced?
A
4.0 x 10-23
B
3.0 x 10–23
C
1.2 x 1024
D
6.0 x 1024
Chemistry JAMB 1987 Q26 ✓ Answer: A
5 g of ammonium trioxonirate (V) on dissolution in water cooled its surrounding water and container by 1.6kJ. What is the heat of solution of NH4NO3?
A
+51.4 kJ mol-1
B
+25.6 kJ mol-1
C
+12.9 kJ mol-1
D
–6.4 kJ mol-1 [N = 14, O = 16, H = 1]
Chemistry JAMB 1987 Q27 ✓ Answer: B
Tetraoxosulphate (1V) acid is prepared using the chemical reaction SO3(g) + H2O(1) H2SO4(1). Given the heat of formation for SO3(g), H2O(1) and H2SO4(1) as –395 kJ mol-1 –286 kJ mol-1 and – 811 kJ mol-1 respectively is
A
-1032 kJ
B
– 130 kJ
C
+130kJ
D
+1032 kJ
Chemistry JAMB 1987 Q28 ✓ Answer: A
The times taken for iodine to be liberated in the reaction between sodium thisosulphate and hydrochloric acid at various temperatures are as follows: TempoC Time (seconds) These results suggest that.
A
for a 10o rise in temperature rate of reaction is doubled
B
for a 10o rise in temperature rate of reaction is halved
C
time taken for iodine to appear does not depend on temperature
D
for a 10o rise in temperature, rate of reaction is tripled.
Chemistry JAMB 1987 Q29 ✓ Answer: C
The reaction between sulphur (1V) oxide and oxygen is represented by the equilibrium reaction 2SO2(g H + O2(g) 2SO3(g), H = - 196 kJ. What factor would influence increased production SO3(g)?
A
Addition of a suitable catalyst
B
Increase in the temperature of the reaction
C
Decrease in the temperature of SO2(g)
D
Decrease in the concentration of SO2(g)
Chemistry JAMB 1987 Q30 ✓ Answer: B
Which of the following equations correctly represents the action of hot concentrated alkaline solution on chlorine?
A
Cl2(g) + 2OH(g) OCl(q) + Cl(q) + H2O(1)
B
3Cl2(g) + 6OH ClO3(aq) + 5Cl (aq) + 3H2O(1)
C
3CI2(g) + 6OH(aq) ClO3(s) + 5Cl- (aq) + 3H2O(1)
D
3Cl2(g) + 6OH(aq) 5ClO3(aq) + Cl (aq) +3H2O(1)
Chemistry JAMB 1987 Q31 ✓ Answer: A
Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produced dense white fumes with a drop of hydrochloric acid. The gas P was
A
nitrogen
B
chlorine
C
oxygen
D
sulphur (1V) oxide [PAGE 19]
Chemistry JAMB 1987 Q32 ✓ Answer: D
The best treatment for a student who accidentally poured concentrated tetraoxosulphate(V1) acid on his skin in the laboratory is to wash he skin with
A
cold water
B
sodium trioxocarbondioxide solution
C
Iodine solution
D
Sodium triocarbonate (1V) solution.
Chemistry JAMB 1987 Q33 ✓ Answer: D
In which of the following pairs of elements is allotropy exhibited by each element?
A
Phosphorus and hydrogen
B
Oxygen and chlorine
C
Sulphur and nitrogen
D
Oxygen and sulphur.
Chemistry JAMB 1987 Q34 ✓ Answer: C
Which of the following gases can best be used for demonstrating the fountain experiment? (i) Nitrogen (ii) Ammonia (iii) Nitrogen (l)oxide (iv) Hydrogen chloride
A
(ii) and (iii)
B
(i) and (iii)
C
(ii) and (iv)
D
(ii) only.
Chemistry JAMB 1987 Q35 ✓ Answer: B
When calcium hydroxide us heated with ammonium tetraoxosulphate (V1), the gas given off may be collected by
A
bubbling it through concentrated H2SO4.
B
Bubbling it through water and then passing it through calcium oxide
C
Passing it directly through calcium oxide
D
Passing it directly through calcium chloride.
Chemistry JAMB 1987 Q36 ✓ Answer: D
Which of the following elements will form oxide which will dissolve both dilute HNO3 and NaOH solution to form salts?
A
Cl
B
Mg
C
Ag
D
Mn
Chemistry JAMB 1987 Q37 ✓ Answer: C
Stainless steel is an alloy of
A
iron, carbon and silver
B
ironm carbon and lead
C
iron, carbon and chromium
D
iron and carbon only.
Chemistry JAMB 1987 Q38 ✓ Answer: D
Alloys are best prepared by.
A
high temperature are welding of the metals
B
electrolysis using the major metallic component as cathode
C
reducing a mixture of the oxides of the elements
D
cooling a molten, mixture of the necessary elements.
Chemistry JAMB 1987 Q39 ✓ Answer: C
Corrosion is exhibited by.
A
iron only
B
electropositive metals
C
metals below hydrogen in the electrochemical series
D
all metals
Chemistry JAMB 1987 Q40 ✓ Answer: C
Inspite of the electronic configuration, 1s22s2p22, carbon is tetravalent because
A
the electrons in both 2s and 2p orbital have equal energy
B
the electrons in both 2s and 2p orbital are equivalent
C
both the 2s and 2p orbital hybridize
D
the six orbital hybridize to four.
Chemistry JAMB 1987 Q41 ✓ Answer: B
Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (1) chloride?
A
CH3CH = CHCH3
B
CH3C——CCH3
C
CH = C—CH2CH3
D
CH2= CH-CH-=CH2
Chemistry JAMB 1987 Q42 ✓ Answer: A
The efficiency of petrol as a fuel in high compression inetrnal combustion engines improves with an increase in the amount of
A
Branched chain alkanes B Straight chain alkanes
C
Cycloalkanes
D
Halogenated hydrocarbons
Chemistry JAMB 1987 Q44 ✓ Answer: B
ethanol reacts with aqueous sodium mono-oxoio date(1) to gives a bright yellow solid with a characteristic smell. The products is
A
trichlomethane
B
ftriiodomethane
C
iodoethane
D
ethanal
Chemistry JAMB 1987 Q45 ✓ Answer: D
The most volatile fraction obtained from fractional distillation of crude petroleum contains
A
butane propane and kerosene
B
butane propane and petrol
C
ethane, methane and benzene
D
ethane methane and propane
Chemistry JAMB 1987 Q46 ✓ Answer: C
Local black soap is made by boiling palm with liquid extract of ash. The function of the ash is to provide the
A
acid
B
ester of alkanoic acid
C
alkali
D
alkanol
Chemistry JAMB 1987 Q47 ✓ Answer: A
Synthetic rubber is made by polymerization of
A
2 methyl buta-1,3-diene
B
2 methl buta-1, 2 – diene
C
2 methyl buta – 1-ene
D
2 methy buta –2-ene
Chemistry JAMB 1987 Q48 ✓ Answer: D
Complete oxidation of propan – 1 – of gives
A
propanal
B
propan-2-L
C
propan-1-one
D
propanoic acid
Chemistry JAMB 1987 Q49 ✓ Answer: C
When water drops are added to calcium carbide in a container and the gas produced is passed called and
A
oxyethylene flame
B
oxyhydrocarbon flame
C
oxyacetylene flame
D
oxymethane flame.