🧪 1995

JAMB Chemistry 1995 past questions

34 questions from the 1995 JAMB UTME Chemistry paper. Free, with answers where available.

Practice with CBT mock → All Chemistry years
Chemistry JAMB 1995 Q1 ✓ Answer: B
Chromatography is used to separate components of mixtures which differ in their rates of
A
diffusion
B
migration C reaction
D
sedimentation.
Chemistry JAMB 1995 Q2 ✓ Answer: B
Which of the following is an example of chemical change?
A
Dissolution of salt in water.
B
Rusting of iron
C
Melting of ice.
D
Separating a mixture by distillation.
Chemistry JAMB 1995 Q3 ✓ Answer: C
The number of hydrogen ions in 4.9 g of tetraoxosulphate (VI) acids is
A
3.01 x 1022
B
6.02 x 1022
C
3.01 x 1023
D
6.02 x 1022. (S = 32, O = 16, H =1, NA = 6.02 x 1023).
Chemistry JAMB 1995 Q4 ✓ Answer: D
What volume of oxygen will remain after reacting 8 cm3 of hydrogen with 20 cm3 of oxygen?
A
10 cm3
B
12 cm3
C
14 cm3
D
16 cm3.
Chemistry JAMB 1995 Q6 ✓ Answer: B
Two cylinders A and B each contains 30 cm3 of oxygen and nitrogen respectively at the same temperature and pressure. If there are 5.0 moles of nitrogen, then the mass of oxygen is
A
3.2 g
B
6.4g
C
80.0g
D
160.0g.
Chemistry JAMB 1995 Q10 ✓ Answer: B
Which letter represents a non-metal that is a solid at room temperature?
A
T
B
R.
C
J.
D
X.
Chemistry JAMB 1995 Q11 ✓ Answer: C
In the oil drop experiment, Milikan determined the
A
charge to mass ratio of the electron
B
mass of the electron
C
charge of the electron
D
mass of the proton.
Chemistry JAMB 1995 Q12 ✓ Answer: B
The stability of ionic solids is generally due to the
A
negative electron affinity of most atoms
B
crystal lattice forces
C
electron pair sharing
D
positive ionization potentials.
Chemistry JAMB 1995 Q14 ✓ Answer: B
Helium is often used in observation balloons because it is
A
light and combustible
B
light and non-combustible
C
heavy and combustible
D
heavy and non-combustible.
Chemistry JAMB 1995 Q15 ✓ Answer: C
When plastic and packaging materials made from chloromethane are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain
A
ethane
B
chlorine
C
hydrogen chlorine
D
ethane.
Chemistry JAMB 1995 Q16 ✓ Answer: C
Deliquescent substances are also
A
efflorescent
B
anhydrous
C
hydroscopic
D
insoluble.
Chemistry JAMB 1995 Q17 ✓ Answer: D
The difference between colloids and suspensions is brought out clearly by the fact that while colloids
A
do not scatter light, suspensions cannot be so separated
B
can be separated by filteration, suspension cannot be separated
C
can be separated by a membrane, suspensions cannot
D
do not settle out on standing, suspensions do.
Chemistry JAMB 1995 Q18 ✓ Answer: D
In general, an increase in temperatue increases the solubility of a solute in water because
A
more solute molecules collide with each other
B
most solutes [PAGE 45] dissolve with the evolution of heat
C
more solute molecules dissociate at higher temperature
D
most solutes dissolve with absorption of heat.
Chemistry JAMB 1995 Q19 ✓ Answer: B
Neutralization involves a reaction between H3O+ and
A
CI-
B
OH-
C
NO3 -
D
CO3 2-.
Chemistry JAMB 1995 Q20 ✓ Answer: D
Which of the following solutions will have a pH < 7?
A
Na2SO4(aq)
B
NaCI(aq)
C
Na2CO3(aq)
D
NH4CI(aq).
Chemistry JAMB 1995 Q21 ✓ Answer: D
What is the pH of a 2.50 x 10-5 M solution of sodium hydroxide?
A
3.6
B
5.0
C
9.4
D
12.0. 25VOL OF BASE
Chemistry JAMB 1995 Q22 ✓ Answer: B
The graph above shows the pH changes for the titration of a
A
strong acid versus strong base
B
weak acid versus strong base
C
strong acid versus weak base.
D
weak acid versus weak base.
Chemistry JAMB 1995 Q23 ✓ Answer: D
In the process of silver-plating a metal M, the metal M is the
A
anode and a direct current is used
B
cathode and an alternating current is used
C
anode and an alternating current is used.
D
cathode and a direct current is used.
Chemistry JAMB 1995 Q24 ✓ Answer: C
How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulphate (VI)?
A
0.5
B
1.0
C
1.5
D
3.0 (F = 96 500 C mol-1).
Chemistry JAMB 1995 Q25 ✓ Answer: B
2Cl-(aq) ’!CI2(g) = 2e- (aq). The above half-cell reaction occurring at the anode during the electrolysis of dilute ZnCI2 solution is
A
ionization
B
oxidation
C
reduction.
D
recombination.
Chemistry JAMB 1995 Q26 ✓ Answer: B
Which of the following is a redox reaction?
A
KCI(ag) + H2SO4(aq) KHSO4(aq) + HCI(aq)
B
2FeBr2(ag) + Br2( !2FeBr3(aq)
C
AgNO3(ag) + FeCI3 !3AgCl(aq) + CO Fe(NO3)3(aq)
D
H2CO3(aq) H2O(l) + CO2(g).
Chemistry JAMB 1995 Q27 ✓ Answer: A
Cr2O7 2- (aq) + 14H+ (ag) + 6I- (aq) ’! 2Cr3+ (ag) + 3I2(g) + 7H2O(1)+. The change in the oxidation number of oxygen in the equation above is
A
O.
B
1
C
2
D
7.
Chemistry JAMB 1995 Q28 ✓ Answer: B
If an equilibrium reaction has “H < O, the reaction will proceed favourably in the forward reaction at
A
low temperature
B
high temperatures
C
all temperatures
D
all pressures.
Chemistry JAMB 1995 Q29 ✓ Answer: C
Which of the following processes lead to increase in entrophy?
A
mixing a sample of NaCl and sand
B
Condensation of water vapour.
C
Boiling a sampled of water
D
Cooling a saturated solution.
Chemistry JAMB 1995 Q31 ✓ Answer: B
The arrangement above can be used for the collection of
A
sulphur (IV) oxide
B
ammonia
C
nitrogen
D
hydrogen chloride.
Chemistry JAMB 1995 Q33 ✓ Answer: A
It can be deduced that the rate of the reaction
A
for path I is higher than path II
B
for path II is higher than path I
C
is the same for both paths at all temperatures
D
depends on the values of both x and y at all pressures.
Chemistry JAMB 1995 Q34 ✓ Answer: C
In the industrial production of hydrogen from natural gas, carbon (IV) oxide produced along with the hydrogen is removed by
A
washing under pressure
B
passing the mixture into the lime water
C
using ammoniacal copper (I) chloride
D
drying over phosphorus (V) oxide.
Chemistry JAMB 1995 Q35 ✓ Answer: B
Sulpur exists in six forms in the solid state. This property is known as
A
isomerism
B
allotrophy
C
isotopy
D
isomorphism.
Chemistry JAMB 1995 Q37 ✓ Answer: C
Which of the following ions will give a white precipitate with aqueous NaOH and soluble in excess of the base?
A
Ca2+
B
Mg2
C
Zn2+
D
Cu2+. [PAGE 46]
Chemistry JAMB 1995 Q38 ✓ Answer: D
In the extraction of iron in the blast furnace, limestone is used to
A
release CO2 for the reaction
B
reduce the iron
C
Increase in the strenght of Iron
D
remove impurities.
Chemistry JAMB 1995 Q39 ✓ Answer: C
Which of the following compound will impart a brick- red colour to a non-luminous Busen flame?
A
NaCl
B
LiCl
C
CaCl2
D
MgCl . 40.. Group 1 A metals are not found free in nature because they
Chemistry JAMB 1995 Q41 ✓ Answer: C
CH3COOH + CH3CH2OH Conc H SO X + Y. X and Y in the reaction of above are respectively
A
CH3 COCH3 and H2O
B
CH3 CH2 COCH2 and H2O2
C
CH3 COOCH2 CH3 and H2O3
D
CH3CH2 CHO and CH4. CHCl3 + Cl2 HCl + CCl4. The reaction above is an example of
Chemistry JAMB 1995 Q43 ✓ Answer: D
CH3 – CH –CH = CH –CH3 CH3. The IUPAC nomenclature for the compound above is
A
1.1-dimenthyilbut –ene
B
2-methlypnet 3 –ene
C
4,4 –dimethy –1but –2 –ene
D
4 –methylpent –2 –ene .
Chemistry JAMB 1995 Q44 ✓ Answer: A
Which of the following pairs has compounds that are isomers?
A
propanal and propanone
B
ethanoic acid and ethylmethanoate
C
ethanoic acid and thane –1 ,2 –diol
D
2 –methylbutnae and 2,2 –dimethylbutane Chemistry 1997