🧪 1984

JAMB Chemistry 1984 past questions

39 questions from the 1984 JAMB UTME Chemistry paper. Free, with answers where available.

Practice with CBT mock → All Chemistry years
Chemistry JAMB 1984 Q3 ✓ Answer: A
For the reaction NH4 NO 2 N2 + 2H2O calculate the volume of nitrogen that would be produced at S.T.P from 3.20 g of the trioxonirate (111) salt.
A
2.24 dm3
B
2.24 cm3
C
1.12 cm3
D
1.12 dm3
E
4.48dm3 (Relative atomic masses: N = 14m O =16, H=1).
Chemistry JAMB 1984 Q4 ✓ Answer: D
Manganese (1V) oxide reacts with concentrated hydrochloric acid according to the equation MnO2 + xHCI MnCI2 + CI +yH2O. x and y are
A
2 and 5 respectively
B
2 and 4 respectively [PAGE 6]
C
and 2 respectively
D
4 and s2 respectively
E
4 and 1 respectively
Chemistry JAMB 1984 Q5 ✓ Answer: B
powdering the reactant if solid
A
1,2 and 3
B
1, 3 and 5
C
2, 3 and 5
D
3 and 4
E
3 and 5 The balance equation for the reaction of tetraoxosulphate (V1) acid with aluminium hydroxide to give water and aluminium tetraoxosulphate (V1) is
Chemistry JAMB 1984 Q6 ✓ Answer: C
Which among the element 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc will NOT react with either water of stream?
A
1 and 2
B
2 and 3
C
3 and 4
D
1, 2, and 3
E
2, 3 and 5
Chemistry JAMB 1984 Q7 ✓ Answer: C
Which of the following statements is NOT true of the elements R, U, S, T, Y?
A
R is an isotope of hydrogen
B
U and Y are isotopes
C
R,U,S and T are metals
D
T is a noble gas
E
S will react with oxygen to form SO
Chemistry JAMB 1984 Q8 ✓ Answer: E
Naphthalene when heated melts at 354K (81oC) . At this temperature the molecules of naphthalene .
A
decompose into smaller molecules
B
change their shape
C
are oxidized by atmospheric oxygen
D
contract
E
become mobile as the inter molecular forces are broken.
Chemistry JAMB 1984 Q9 ✓ Answer: A
The ration of the number of molecules in 2g of hydrogen to that in 16 g of oxygen is
A
2:1
B
1:1
C
1:2
D
1:4
E
1:8
Chemistry JAMB 1984 Q12 ✓ Answer: C
Fig. 2. The solubility curves of four substances are shown in Fig.2. Which of the four substances would crystallize from a saturated solution cooled from 353 K (80oC) to 323 K (50oC)
A
P and Q
B
P and R
C
P and S
D
R and S
E
Q and R.
Chemistry JAMB 1984 Q13 ✓ Answer: A
which of the following mixtures would result in a solution of pH greater than 7?
A
25.00 cm3 of 0.05 M H2SO4 and 25.00 cm3 of 0.50 m Na2CO3
B
25.00 cm3 of 0.50 M H2SO4 and 25;00 cm3 of 0.10 M NaHCO3
C
25.00 cm3 of 0.11 M H2SO4 and 25.00 cm3 of 0.10 M NaOH
D
25.00 cm3 of 0.11 M H2SO4 and 50.00 cm3 of 0.50 M NaOH
E
25.00 cm3 of 0.25 MH2SO4 and 50.00 cm3 of) .20 M NaOH
Chemistry JAMB 1984 Q14 ✓ Answer: D
In which of the following reactions does hydrogen peroxide acts as a reducing agent?
A
H2S + H2O S + 2H2O
B
PbSO3 + H2O2 PbSO4 + H2O
C
2‘! + 2H + H2O I2 + 2H2O
D
PbO2 + 2HNO3 +H2O2 Pb (NO3)2 + 2H2O + O2
E
SO + H2O2 H2SO4
Chemistry JAMB 1984 Q15 ✓ Answer: C
For the reaction 2Fe + 2 e- 2Fe2+ +I2, which of the following statements is TRUE?
A
Fe is oxidized to Fe3
B
Fe3+ is oxidized to Fe2+ [PAGE 7]
C
I- is oxidized to I2
D
I- is reduced to I2
E
I- is displacing an electron from Fe3+
Chemistry JAMB 1984 Q16 ✓ Answer: E
The diagram above (Fig.3) shows the energy profile for the reaction A+B = C+
A
spontaneous
B
isothermal
C
adiabatic
D
form this diagram, its clear that the reaction is
E
endothermic
Chemistry JAMB 1984 Q17 ✓ Answer: D
In dilute solute the heat of the following NaOH + HCI = NaCI + H2O + H2SO4 Na2SO4 + 2H2O is
A
+28.65 kJ
B
–28.65kJ
C
+57.3 kJ
D
–114.6 kJ
E
–229.2 kJ
Chemistry JAMB 1984 Q18 ✓ Answer: E
For the reactions: (1 Melon oil + NaOH ! Soap + Glycerol (11) 3Fe + 4H2O Fe3O4 + 4H2 (111) N2O4 2NO2. Which of the following statements is true?
A
Each of the three reactions requires a catalyst
B
All the reactions demonstrate Le Chatelier’s principle
C
The presence of a catalyst will increase the yield of products
D
Increase in pressure will result in higher yields of the products in 1 and 11 only
E
Increase in pressure will result in higher of the products in 111 only.
Chemistry JAMB 1984 Q19 ✓ Answer: C
Which of the following methods may be used to prepare trioxonirate (V) acid (nitric acid) in the laboratory?
A
Heating ammonia gas with tetraoxosulphate (1V) acid
B
Heating ammonium trioxosulphate (V) with tetraoxonitrate (V) acid
C
Heating sodium trioxonirate (v) with tetraoxosulphate (V1) acid
D
Heating potassium trioxonirate (V) with calcium hydroxide.
E
Heating a mixture of ammonia gas and oxygen\
Chemistry JAMB 1984 Q20 ✓ Answer: A
Lime –water, which is used in the laboratory for the detection of carbon (1V) oxide, is an aqueous solution of:
A
Ca (OH)2
B
CaCO3
C
CaHCO3
D
CaSO4
E
N2CO3
Chemistry JAMB 1984 Q21 ✓ Answer: E
An element that can exist in two or more different structure forms which possess the desame chemical properties is said to exhibit
A
polymerism
B
isotropy
C
isomorphism
D
isomerism
E
allotropy.
Chemistry JAMB 1984 Q23 ✓ Answer: B
Which off the following statements is NOT true of carbon monoxide?
A
CO is poisonous
B
CO is readily oxidized at room temperature by air to form Co2
C
CO may be prepared by reducing CO2, mixed coke heated to about 1000oC
D
CO may be prepared by heating charcoal with a limited amount of O2
E
CO is a good reducing agent.
Chemistry JAMB 1984 Q24 ✓ Answer: D
From the reactions: ZnO + Na2O Na2ZnO and ZnO+ CO2 ZnCO3 it may be concluded that zinc oxide is
A
neutral
B
basic
C
acidic
D
amphoteric
E
a mixture
Chemistry JAMB 1984 Q25 ✓ Answer: D
An example of a neutral oxide is
A
AL2O3
B
NO2
C
CO2
D
CO
E
SO2
Chemistry JAMB 1984 Q26 ✓ Answer: A
3CI2+ 2NH3 N2 + 6HCI. In the above reaction, ammonia acts as .
A
a reducing agent
B
an oxidizing agent
C
an acid
D
a catalyst
E
a drying agent
Chemistry JAMB 1984 Q27 ✓ Answer: C
In the Haber process for the manufacturer of ammonia, finely divided iron is used as
A
an ionizing agent
B
a reducing agent
C
a catalyst
D
a dehydrating agent
E
an oxidizing agent.
Chemistry JAMB 1984 Q28 ✓ Answer: D
An organic compound with a vapour density 56.5 has the following percentage composition: C = 53.1%, N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is
A
C3H6O2N
B
C5H6O2N
C
(C5H7O2N)½
D
C5H7O2N
E
(C5H7ON)2. Relative atomic masses: N = 12.4%, O = 28.3%, H = 1) [PAGE 8]
Chemistry JAMB 1984 Q30 ✓ Answer: D
When the kerosene fraction form petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as
A
polymerization
B
refining
C
hydrogenation
D
cracking
E
fractional distillation O
Chemistry JAMB 1984 Q31 ✓ Answer: C
CH3- CH2- C OH Is
A
acetic acid
B
propanal
C
propanol
D
ethanoic acid
E
propanoic acid
Chemistry JAMB 1984 Q32 ✓ Answer: B
Alkaline hydrolysis of naturally occurring fats and oils yields.
A
fats and acids
B
soaps and glycerol
C
margarine and butter
D
esters
E
detergents.
Chemistry JAMB 1984 Q33 ✓ Answer: E
Which of the following represents a carboxylic acid? OH
A
R C O OR
B
R C O
C
H2SO4,
D
R - COOCOR H
E
R C O
Chemistry JAMB 1984 Q34 ✓ Answer: E
which of the statement is INCORRECT?
A
fractional distillation of crude petroleum will give following hydrocarbon fuels in order of increasing boiling point: Butane < petrol < kerosene
B
H2C = CH2 will serve as a monomer in the preparation of polythene
C
Both but – 1- ene and but –1-1yne will decolorize bromine readily.
D
But –2 – ene will react with chlorine to form 2, 3 – dichlorobutane.
E
Calcium carbide will react with water to form any alkayne
Chemistry JAMB 1984 Q35 ✓ Answer: A
which of the following statement is NOT correct about all four of the acids: HBr, HNO3 H2CO3 and H2SO4? They
A
dissolve marble to liberate litmus red
B
have a pH less than 7
C
turn blue litmus red
D
neutralize alkalis to form salt
E
react with magnesium to liberate hydrogen.
Chemistry JAMB 1984 Q36 ✓ Answer: D
If the cost of electricity required to deposit 1 g old magnesium is N5.00. How much salt would it cost to deposit 10 g of aluminium?
A
N10.00
B
N27.00
C
N44.44
D
N66.67
E
N33.33. (Relative atomic masses: AI = 27, Mg = 24). 37, In an experiment, copper tetraoxosulphate (V1) solution was electolysed using copper electrodes, The mass of copper deposited at the cathode by the passage of 16000 coulombs of electricity is
Chemistry JAMB 1984 Q39 ✓ Answer: C
Nitrogen can best be obtained from a mixture of oxygen and nitrogen by passing the mixture over
A
potassium hydroxide
B
heated gold
C
heated magnesium
D
heated phosphorus
E
calcium chloride.
Chemistry JAMB 1984 Q40 ✓ Answer: C
Water is said to be ‘hard’ if it
A
easily forms ice
B
has to be warmed before sodium chloride dissolves in it
C
forms an insoluble scum with soar
D
contains nitrates
E
contains sodium ions.
Chemistry JAMB 1984 Q41 ✓ Answer: B
Sodium hydroxide (NaOH) pellets are
A
deliquescent
B
hygroscopic
C
efflorescent
D
hydrated
E
fluorescent.
Chemistry JAMB 1984 Q42 ✓ Answer: D
Which of the following structure formulae is NOT numeric with others?
A
H H H H | | | | H–C- C - C – OH | | | | H H H H [PAGE 9]
B
H H H H | | | | H–C- O- C - C – C- H | | | | H H H H
C
H H H H | | | | H–C- C - C – C- H | | | | H OH H H
D
H O H | | H–C- C - C – C- H | | | | H H H H
E
H H O H | | H–C - C - C – C- H | | | | H H H H
Chemistry JAMB 1984 Q44 ✓ Answer: D
If an excess of a liquid hydrocarbon is poured into a jar of chlorine, and the sealed jar is then exposed for several hours to bright sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone
A
a polymerization reaction
B
an isomerixation reaction
C
an addition reaction
D
a substitution reaction
E
a reduction reaction
Chemistry JAMB 1984 Q45 ✓ Answer: C
The function of conc. H2SOH4 in the etherification of ethanoic acid with ethanol is to
A
serves as a dehydrating agent
B
serves as solvent
C
act as a catalyst
D
prevent any side reaction
E
serve as an oxidizing reaction
Chemistry JAMB 1984 Q48 ✓ Answer: A
An aqueous solution of a metal salt, Mm gives a white precipate with NaOH, which dissolves in excess NaOH. With aqueous ammonium the solution of M also gives a white precipate which dissolves in excess ammonia. Therefore the caution in M is
A
Zn++
B
Ca++
C
AI+++
D
Pb++
E
Cu++
Chemistry JAMB 1984 Q49 ✓ Answer: D
The I.U.P.A. C name for the compound H | CH- C – CH2 - CH3 | CH3 is
A
isopropylethene
B
acetylene
C
3-methylbutane
D
2-methybutane
E
5-methypentane.
Chemistry JAMB 1984 Q50 ✓ Answer: D
At S.T.P how many litres of hydrogen can be obtained from the reaction of 500cm3 of 0.5 M H2SO4 excess zinc metal.
A
22.4 dm3
B
11.2 dm3
C
6.5 dm3
D
5.6 dm3
E
0.00 dm3 (Gram molecular volume of H2 = 22.4 dm3) [PAGE 10] Chemistry 1985 Fig. 1 Figure shows part of the periodic Table. Which of the elements belongs to the p-block?