🧪 2003

JAMB Chemistry 2003 past questions

35 questions from the 2003 JAMB UTME Chemistry paper. Free, with answers where available.

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Chemistry JAMB 2003 Q1 ✓ Answer: B
H = Is1 II N = Is22s22p3 III O = Is22s22p4 IV Zn = Is22s22p63s23p64s23d10 From the above, which of the following pairs is likely to be paramagnetic?
A
I and II
B
I and III
C
I and IV
D
I and IV
Chemistry JAMB 2003 Q5 ✓ Answer: D
3Cu + pHNO3 3Cu(NO3)2 + 4H2O + xNO In the equation above, the values of p and x respectively are
A
1 and 3
B
2 and 3
C
6 and 2
D
8 and 2
Chemistry JAMB 2003 Q6 ✓ Answer: C
Neutral atoms of neon with atomic number 10 have the same number of electrons as
A
O2+
B
Ca2+
C
K+.
D
Mg+ [PAGE 66]
Chemistry JAMB 2003 Q7 ✓ Answer: A
The noble gases owe their inactivity to
A
octet configuration
B
cyclic shape
C
hexagonal shape
D
obtuse configuration
Chemistry JAMB 2003 Q8 ✓ Answer: B
According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to
A
decrease
B
increase
C
remain constant
D
be zero
Chemistry JAMB 2003 Q11 ✓ Answer: A
When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes
A
negatively charged
B
positively charged
C
neutral
D
bipolar
Chemistry JAMB 2003 Q12 ✓ Answer: D
The weakest attractive forces that can be observed between two molecules is
A
ionic
B
covalent
C
coordinate covalent
D
Van der Waals.
Chemistry JAMB 2003 Q14 ✓ Answer: D
Which of the following ions is acidic?
A
K+
B
NO3 -
C
S2-
D
H3O+
Chemistry JAMB 2003 Q15 ✓ Answer: A
The structural component that makes detergent dissolve more quickly in water than soap is
A
-SO3-Na+
B
-COO- Na+
C
–SO4 -Na+
D
-COO- K+
Chemistry JAMB 2003 Q18 ✓ Answer: B
Farmlands affected by crude-oil spillage can be decontaminated by
A
adding acidic solution
B
using aerobic bacteria
C
pouring water on the affected area
D
burning off the oil from the area.
Chemistry JAMB 2003 Q19 ✓ Answer: D
When 10g of sodium hydroxide is dissolved in 100cm3 of water, the solution formed is approximately
A
0.01 mol dm-3
B
0.10 mol dm-1
C
0.25 mol dm-1
D
0.50 mol dm-1 [Na = 23, H= 1, O = 16]
Chemistry JAMB 2003 Q21 ✓ Answer: A
If an equilibrium reaction has H > 0, the reaction will proceed favourable in the forward direction.
A
high temperature
B
any temperature
C
low temperature
D
minimum temperature
Chemistry JAMB 2003 Q22 ✓ Answer: C
2HCl(aq)+CaCO3 CaCl2(s) + CO2(g)+H2O(1) From the reaction above, which of the curves in the diagram represents the production of carbon(IV) oxide as dilute HCl is added?
A
L
B
M
C
N
D
P
Chemistry JAMB 2003 Q23 ✓ Answer: B
The commonest feature of reaction at the anode is that
A
electrons are consumed
B
oxidation is involved
C
ions are reduced
D
electrode dissolves
Chemistry JAMB 2003 Q24 ✓ Answer: A
Which of the following will change when a catalyst is added to a chemical reaction?
A
The activation energy
B
The potential energy of the reactants
C
The heat of reaction
D
The potential energy of the products. [PAGE 67]
Chemistry JAMB 2003 Q25 ✓ Answer: B
If Y is an oxidizing agent that reacts with a reducing agent, Z, which of the following is correct?
A
Y increases in oxidation number
B
Y becomes reduced
C
Z loses protons
D
Z gains protons.
Chemistry JAMB 2003 Q26 ✓ Answer: C
When at equilibrium, which of the reactions below will shift to the right if the pressure is increased and the temperature is kept constant
A
2SO3(g) 2SO2(g) + O2(g)
B
2SO2(g) 2CO(g) + O2(g)
C
2H2(g) +’!O2(g) 2H2O (g)
D
2NO(g) N2(g) + O2(g)
Chemistry JAMB 2003 Q27 ✓ Answer: D
In the electrolysis of a concentrated solution of sodium chloride using inert electrodes, which of the following ions are discharge at the cathode and anode respectively?
A
Na+ and Cl-
B
Na+ and OH-
C
H+ and OH-
D
H+ and Cl-
Chemistry JAMB 2003 Q28 ✓ Answer: C
CO(g) + H2O(g) CO2(g) + H2(g) From the reaction above, calculate the standard heat change if the standard enthalpies of formation of CO2(g) , H2O(g) and CO(g) in kJ mol-1 are –394, -242 and –110 respectively.
A
-262 kJmol-1
B
–42 kJmol-1
C
+42 kJmol-1
D
+262 kJmol-1
Chemistry JAMB 2003 Q29 ✓ Answer: A
When sugar is dissolved in a tea, the reaction is always accompanied by
A
positive entropy change
B
negative entropy change
C
no entropy change
D
a minimum entropy change.
Chemistry JAMB 2003 Q30 ✓ Answer: B
Which of the following is an electrolyte?
A
Alcohol
B
Sodium acetate solution
C
Solid potassium hydroxide
D
Mercury
Chemistry JAMB 2003 Q31 ✓ Answer: A
Chlorine gas is prepared in the laboratory by
A
adding concentrated hydrochloric acid to solid manganese (1V) oxide
B
adding concentrated tetraoxosulphate (V1) acid to solid sodium chloride
C
dropping concentrated hydrochloric acid onto potassium tetraoxomanganate (V11) crystals
D
oxidizing concentrated hydrochloric using potassium heptadichromate (V1) crystals.
Chemistry JAMB 2003 Q32 ✓ Answer: C
Metal of the transition series have special properties which are different from those of groups 1 and 11 elements because they have partially filled
A
s orbitals
B
p orbitals
C
d orbitals
D
f orbitals
Chemistry JAMB 2003 Q33 ✓ Answer: D
Hydrogen can be displace form a hot alkaline solution by.
A
Fe
B
Cu
C
Ca
D
Sn
Chemistry JAMB 2003 Q34 ✓ Answer: C
Which of the following statements is true of sulphur (1V) oxide?
A
It forms tetraoxosulphate(V1) acid with water
B
It is an odourless gas
C
It is an acid anhydride
D
It forms white precipitate with acidified barium chloride.
Chemistry JAMB 2003 Q35 ✓ Answer: B
The salt that will form a precipitate soluble in excess ammonia solution is
A
Ca(NO3)2
B
Cu(NO3)2
C
Mg(NO3)2
D
Al(NO3)2
Chemistry JAMB 2003 Q36 ✓ Answer: C
The metal liberates hydrogen from cold water in bubbles only is
A
Na
B
K
C
Ca
D
Al
Chemistry JAMB 2003 Q37 ✓ Answer: B
Chlorine gas turns a damp starch-iodine paper
A
pink
B
colourless
C
red
D
dark blue
Chemistry JAMB 2003 Q38 ✓ Answer: B
The modern process of manufacturing steel form iron is by
A
treatment with acids
B
oxidation
C
blast reduction
D
treatment with alkalis
Chemistry JAMB 2003 Q39 ✓ Answer: A
In the diagram above, Y is
A
NO
B
NO2
C
N2O5
D
N2O4
Chemistry JAMB 2003 Q40 ✓ Answer: B
Ethene reacts with hydrogen bromide to give
A
CH2Br2
B
CH3 CH2Br
C
C2 H2Br2
D
CHBr3
Chemistry JAMB 2003 Q41 ✓ Answer: C
Carbohydrates are compounds containing carbon hydrogen and oxygen in the ration
A
3 : 1: 1
B
2 : 1: 1
C
1 : 2: 1
D
1 : 1: 1 How many isomers does pentane have?
Chemistry JAMB 2003 Q44 ✓ Answer: C
The formula for ethyl butanoate is
A
C3H7COOC2H5
B
C2H5COOC3H7
C
C4H9COOC2H5
D
C2H5COOC4H9
Chemistry JAMB 2003 Q45 ✓ Answer: D
The type of reaction that is peculiar to benzene is
A
addition
B
hydrolysis
C
polymerization
D
substitution
Chemistry JAMB 2003 Q46 ✓ Answer: D
Ethanol reacts with excess acidified K2Cr2O7
A
ethanedioc acid
B
ethanol
C
ethyl ethanoate
D
ethanoic acid