🧪 1986

JAMB Chemistry 1986 past questions

47 questions from the 1986 JAMB UTME Chemistry paper. Free, with answers where available.

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Chemistry JAMB 1986 Q2 ✓ Answer: B
Which of the following substances is a mixture?
A
Granulated sugar
B
Sea-water
C
Sodium chloride
D
Iron fillings
Chemistry JAMB 1986 Q3 ✓ Answer: B
10cm3 of hydrogen fluoride gas reacts with 5cm3 of dinitrogen difllouride gas (N2F2) to form 10cm3 of a single gas. Which of the following is the most likely equation to the reaction?
A
HF + N2F2 N2HF3
B
2HF + N2F2 2NHF2
C
2HF + N2F2 N2H2F4
D
HF +2N2F2 N4HF4 [PAGE 14]
Chemistry JAMB 1986 Q3 ✓ Answer: C
The number of molecules of carbon (1V) oxide produced when 10.0 g CaCO3 is treated with 0.2 dm3 of 1 M HCl in the equation CaCO3 + 2HCI CaCl2 + H2O + CO2 is
A
1.00 x 1023
B
6.02 x 1023
C
6.02 x 1022
D
6.02 x 10 23 [Ca = 40, O = 16, C = 12, NA = 6.02 x 1023, H = 1, Cl = 35.5]
Chemistry JAMB 1986 Q4 ✓ Answer: A
The number of atom chlorine present in 5.85 g of NaCI is
A
6.02 x 1022
B
5.85 x 1023
C
6.02 x 1023
D
5.85 x 1024 [Na = 23, Cl = 35.5] Avogadro’s Number = 6.02 x 1023]
Chemistry JAMB 1986 Q4 ✓ Answer: B
In the reaction CaC2(s) + 2H2O(1) Ca (OH2(s)+ C2H2(g) what is the mass of solid acetylene gas at S.T.P?
A
3.8 g
B
2.9 g
C
2.0 g D 1.0 g [C = 12, Ca –40, G.M.V = 22400 cm3]
Chemistry JAMB 1986 Q5 ✓ Answer: D
How much of magnesium is required to react with 250cm3 of 0.5 M HCl?
A
0.3 g
B
1.5 g
C
2.4 g
D
3.0 g [Mg = 24]
Chemistry JAMB 1986 Q5 ✓ Answer: C
If the quality of oxygen occupying a 2.76 liter container at a pressure of 0.825 atmosphere and 300 K is reduced by one-half, what is the pressure exerted by the remaining gas?
A
1.650 atm
B
0.825 atm
C
0.413 atm
D
0.275 atm
Chemistry JAMB 1986 Q6 ✓ Answer: C
200cm3 of oxygen diffuse through a porous plug in 50 seconds. Hoe long will 80 cm3 of methane (CH4) take to diffuse through the same porous plug under the same conditions?
A
20 sec
B
20 sec
C
14 sec
D
7 sec [C = 12, O = 16, H = 1]
Chemistry JAMB 1986 Q6 ✓ Answer: D
Which of the following substances has the lowest vapour density?
A
Ethanoic acid
B
Propanol
C
Dichlomethane
D
Ethanal [O = 16, Cl = 35.5, H =1, C = 12]
Chemistry JAMB 1986 Q7 ✓ Answer: C
If d represents the density of a gas and K is a constant, the rate of gaseous diffusion is related to the equation
A
r = k d
B
r = kd
C
r = k d
D
r = k d
Chemistry JAMB 1986 Q8 ✓ Answer: B
An element with atomic number twelve is likely to be
A
electrovalent with a valency of 1
B
electrovalent with a valency of 2
C
covalent with a valency of 2
D
covalent with a valency of 4
Chemistry JAMB 1986 Q9 ✓ Answer: C
Which of the following group of physical properties increases form left to right of the periodic table? 1 lonization energy 2 Atomic radius 3Electronegativity 4 Electron affinity
A
1 and 2
B
1, 2 and 3
C
3 and 4
D
1, 2, 3 and 4
Chemistry JAMB 1986 Q10 ✓ Answer: D
When 50 cm3 of a saturated solution of sugar (molar mass 342.0 g) at 40oC was evaporated to dryness, 34.2 g dry of solid was obtained. The solubility of sugar of 40oC is
A
10.0 moles dm-3
B
7.0 moles dm-3
C
3.5 moles dm-3
D
2.0 moles dm-3
Chemistry JAMB 1986 Q11 ✓ Answer: A
In the solubility curve above, water at 98oC is saturated with KCl impurity in the crystals formed when the solution is cooled to 30oC?
A
NaHSO4, Ph<5
B
Na2CO3, Ph>8
C
Na2Cl, Ph =7
D
NaHCO3, Ph <6
Chemistry JAMB 1986 Q13 ✓ Answer: A
Which of the following is an acid salt?
A
NaHSO4
B
Na2SO4
C
CH3CO2Na
D
Na2S
Chemistry JAMB 1986 Q14 ✓ Answer: D
Which of the following solution will conduct the least amount of electricity?
A
2.00 M aqueous solution of NaOH
B
0.01 M aqueous solution of NaOH
C
0.01 m aqueous solution of hexaonic acid
D
0.01 M aqueous solution of sugar.
Chemistry JAMB 1986 Q15 ✓ Answer: A
In the electrolysis of aqueous solution of K2SO4 in the above cell, which species migrate to the anode?
A
SO4 2- and OH-
B
K+ and SO2-
C
OH and H3O
D
H3O and K+
Chemistry JAMB 1986 Q16 ✓ Answer: C
How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?
A
3.90 x 102 coulombs
B
5.50 x 103 coulombs
C
6.54 x 103 coulombs
D
2.34 x104 coulombs
Chemistry JAMB 1986 Q17 ✓ Answer: D
Which of these represents a redox reaction?
A
AgNO3 + NaCl AgCl + NNO3
B
H2s + Pb(NO3)2 PbS + 2HNO3
C
CaCO3 CaO + CO2
D
Zn + 2HCl ZnCI2 + H2 [PAGE 15]
Chemistry JAMB 1986 Q19 ✓ Answer: D
20 cm3 of 0.1 molar NH4OH solution when neutralized with 20.05 cm3 of 0.1 molar HCl liberated 102 Joules of heat. Calculate the heat of neutralization of NH4OH
A
-51.0 kJ mol-1
B
+57.3 kJ mol-1
C
+57.0kJ mol-1
D
+51.0kJ mol-1
Chemistry JAMB 1986 Q20 ✓ Answer: C
What is the consequence of increasing pressure on the equilibrium reaction ZnO(s) + H2(g Zn(s) + H2O(i)
A
The equilibrium is driven to the left
B
The equilibrium is driven to the right
C
There is no effect
D
More ZnO(s) is produced
Chemistry JAMB 1986 Q21 ✓ Answer: C
The approximate volume of air containing 10cm of oxygen is
A
20 cm3
B
25 cm3
C
50 cm3
D
100 cm3
Chemistry JAMB 1986 Q22 ✓ Answer: E
The reaction Mg + H2O MgO + H2 takes place only in the presence of
A
excess Mg ribbon
B
excess cold water C very hot water
E
steam
Chemistry JAMB 1986 Q23 ✓ Answer: B
When steam is passed through red hot carbon, which of the following are produced?
A
Hydrogen and oxygen and carbon(1V) oxide
B
Hydrogen and carbon (1V) oxide
C
Hydrogen and carbon (11) oxixde
D
Hydrogen and trioxocarbonate(1V) acid
Chemistry JAMB 1986 Q24 ✓ Answer: C
Which of the following contains an efflorescent, a deliquescent and a hydroscopic substance respectively?
A
Na2SO4, concentrated H2SO2 CaCl2
B
Na2CO3.H2O, FeSO2.7H2O, concentrated H2SO4
C
Na2CO3. 10H2O, FeCl3 concentrated H2SO4
D
Concentrated H2SO4, FeSO4.7H2O, MgCl2
Chemistry JAMB 1986 Q25 ✓ Answer: D
The tabulated results below were obtained by titrating 10.0 cm3 of water with soap. The titration was repeated with the same sample of water after boiling. Before boiling After boiling Final (cm3) 25.0 20.0 Initial (cm3) 10.00 15.0 The ratio of permanent to temporary hardness is
A
1:5
B
1:4
C
4:1
D
5:1
Chemistry JAMB 1986 Q26 ✓ Answer: B
The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain
A
CO and SO3
B
CO and SO2
C
CO, SO2 and SO3
D
CO and H2S
Chemistry JAMB 1986 Q27 ✓ Answer: A
Oxygen-demanding wastes are considered to be a water pollutant because they.
A
deplete oxygen which is necessary for the survival of aquatic organisms
B
increase oxygen which is necessary for the survival of aquatic organisms
C
increase other gaseous species which are necessary for survival of aquatic organisms
D
deplete other gaseous species which are necessary for the survival of aquatic organisms.
Chemistry JAMB 1986 Q28 ✓ Answer: C
Which of the following will react further with oxygen to form a higher oxide?
A
NO and H2O
B
CO and CO2
C
SO2 and NO
D
CO2 and H2O
Chemistry JAMB 1986 Q29 ✓ Answer: A
In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the elements(s) in each of the gases X and Y respectively?
A
H and S;Cl
B
H and O; Cl
C
H and S;C and O
D
H and Cl;S and O
Chemistry JAMB 1986 Q30 ✓ Answer: C
Which of the following sulphides is insoluble in dilute HCl?
A
Na2S
B
ZnS
C
CuS
D
FeS
Chemistry JAMB 1986 Q31 ✓ Answer: C
When chlorine is passes into water and subsequently exposed to sunlight, the gas evolved is
A
HCl
B
HOCl
C
O2
D
Cl2O2
Chemistry JAMB 1986 Q32 ✓ Answer: A
Which of the following metals does NOT form a stable trioxocarbonate(1V)
A
Fe
B
Al
C
Zn
D
Pb
Chemistry JAMB 1986 Q33 ✓ Answer: B
Which of the following metals with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H2SO4. Substance Z is.
A
NaHS
B
Na2SO3
C
NaS
D
NaHSO3
Chemistry JAMB 1986 Q34 ✓ Answer: B
Ammonia gas is normally dried with
A
concentrated sulphuric acid
B
quicklime
C
anhydrous calcium chloride
D
magnesium sulphate, [PAGE 16]
Chemistry JAMB 1986 Q35 ✓ Answer: B
What are the values of x, y and z respectively in the equation xCu +yHNO3 xCu(NO3)2 + 4H2O + zNO?s
A
4;1;2
B
3;8;2
C
2;8;3
D
8;3;2
Chemistry JAMB 1986 Q36 ✓ Answer: B
The iron (111) oxide impurity in bauxite can be removed by
A
fractional crystallization in acid solution
B
dissolution in sodium hydroxide and filtration
C
extraction with concentrated ammonia and reprecipitation
D
electrolysis of molten mixture.
Chemistry JAMB 1986 Q39 ✓ Answer: C
Which of the following compounds would give lilac fame coloration and a white precipitate with acidified barium chloride solution?
A
KCl
B
NaNO3
C
K2SO
D
CaSO4
Chemistry JAMB 1986 Q40 ✓ Answer: D
How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores?
A
Electrolysis of the solution of its salt
B
Decomposition of its oxide
C
Displacement from solution by an alkali metal
D
Electrolysis of fused salt
Chemistry JAMB 1986 Q41 ✓ Answer: B
Which of the following is NOT correct for the named organic compound in each case?
A
Butanoic acid solution gives effervescence with Na2CO3 solution
B
Glucose when reacted with Na2CrO4 at 0oC will show immediate discharge of colour
C
When but-2-ene is reacted with dilute solution of KmnO4 the purple colour of KMnO is discharge readily even at room temperature
D
When butan-2-ol is boiled with Butanoic acid with a drop of concentrated H2SO4 a sweet smelling liquids is produced.
Chemistry JAMB 1986 Q42 ✓ Answer: B
Which of the following is used as an‘anti-knock’ in automobile engines?
A
Tetramethyl silane
B
Lead tetra-ethyl
C
Glycerol
D
N-heptanes
Chemistry JAMB 1986 Q43 ✓ Answer: B
What reaction takes place when palm-oil is added to potash and foams are observed?
A
Neutralization
B
Saponification
C
Etherification
D
Salting-out
Chemistry JAMB 1986 Q46 ✓ Answer: C
When ethanol is heated with excess concentrated sulphuric acid, the ethanol is
A
oxidized to ethene
B
polymerized to polyethene
C
dehydrated to ethene
D
dehydrated to ethyne.
Chemistry JAMB 1986 Q47 ✓ Answer: B
Which of the following compounds is NOT formed by the action of chlorine on methane?
A
CH3Cl
B
C2H5Cl
C
CH2Cl2
D
CHCl3
Chemistry JAMB 1986 Q48 ✓ Answer: B
The general formula of an alkyl halide (where X represent the halide) is
A
CnH2n-2X
B
–CnH2n +1X
C
CnH2n +2X
D
CnH2nX
Chemistry JAMB 1986 Q49 ✓ Answer: B
Which of the following are made by the process of polymerization?
A
Nylon and soap
B
Nylon and rubber
C
Soap and butane
D
Margarine and Nylon
Chemistry JAMB 1986 Q50 ✓ Answer: B
Starch can converted to ethyl alcohol by
A
distillation
B
fermentation
C
isomerization
D
cracking. [PAGE 17]