UTME Past Questions
Chemistry · 2025
40 questions
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/ 40
Question 01
If pressure (p) of a gas is increased while its temperature (T) remains constant what happens to its volume (v)?
A
Volume increase
B
volume remains constant
C
Volume decreses
D
Volume becomes zero
Question 02
If the PH of a substance is 3 what is the concentration of H
3
O
+
?
A
1×10
-3
mol/dm
3
B
1×10
4
mol/dm
3
C
1×10
3
mol/dm
3
D
3×10
1
mol/dm
3
Question 03
What colour change occurs when potassium dichromate (K
2
Cr
2
O
7
) react with a reducing agent?
A
Orange to Green
B
Green to Orange
C
Red to Blue
D
Yellow to Brown
Question 04
Which oxide pollutant causes irritation of eyes, nose and respiratory tract?
A
Carbon monoxide
B
Nitrogen oxide
C
sulphur dioxide
D
Ozone
Question 05
What is the IUPAC name of the compound C
6
H
5
OH?
A
Benzyl alcohol
B
Phenol
C
Benzene hydroxide
D
Hydroxybenzene
Question 06
What is the main product formed when an alkene undergoes hydration in the presence of concentration H
2
SO
4
?
A
Alcohol
B
Alkane
C
Ketone
D
Ester
Question 07
Acid hydrolysis of maltose produces
A
Fructose
B
Mannose
C
Glucose
D
Galatoes
Question 08
How many isomers does C
4
H
10
have
A
2
B
3
C
4
D
5
Question 09
What is formed when calcium reacts with water?
A
Calcium oxide
B
Calcuium hydroxide
C
Calcium Carbonate
D
Calcium Nitrate
Question 10
What is the hybridizationof the central atom in methane (CH
4
)?
A
sp
B
sp
2
C
sp
3
D
sp
3
d
Question 11
Why is aluminum used in the construction of airplanes?
A
It is malleable and heavy
B
. It resists water
C
It is light and does not corrode easily
D
It is magnetic and shiny
Question 12
Which formula is used to calculate the number of moles using pressure, volume and temperature?
A
PV = nRT
B
V = nRTC
C
n = PVRT
D
n = RTVP
Question 13
Thermal decomposition of potassium nitrate (KNO3) produces:
A
Potassium oxide and oxygen
B
potassium nitrate and oxygen
C
Potassium nitrate and nitrogen
D
Potassium and nitrogen dioxide
Question 14
Which of these metals is used for screening magnetic fields in electrical devices?
A
Brass
B
Iron
C
Copper
D
Zinc
Question 15
What is the main product formed from the decomposition of ammonium trioxonitrate (VI)
A
Nitrogen gas
B
Nitrogen (I) oxide
C
Ammonia
D
Oxygen
Question 16
If a gold and sliver bar are field together for years and gold particles are later found in the sliver which process has occurred?
A
Diffusion
B
Osmosis
C
Sublimation
D
Brownian motion
Question 17
Which of the following contributes least to the greenhouse effect?
A
Carbon sequestration
B
Methane osmosis
C
Combustion
D
Deforestation
Question 18
Which of these is not a colligative property?
A
Boiling point elevation
B
Surface tension
C
Freezing point depression
D
Osmotic pressure
Question 19
Which is a suitable drying agent for H2 gas?
A
Concentration H
2
SO
4
B
Anhydrous CaCl
2
C
P
4
O
10
D
NaOH
Question 20
Which of the following elements has the smallest atomic radius?
A
Sodium
B
Chlorine
C
Magnesiun
D
Phosphorus
Question 21
The equilibrium constant K
c
is affected by:
A
Pressure
B
Concentration
C
Catalyst
D
Temperature
Question 22
The rate of a chemical reaction can be expressed as:
A
Color
B
Concentration
C
Presence of light
D
Change in concentration time
Question 23
Which of the following is a redox reaction
A
HCL+ NaOH → NaCL+
B
Zn + Cu
2+
→ Zn
2+
+ Cu
C
Cl
2
+ Na
2
SO
4
→ BaSO
4
+2NaCL
D
HNO3 + HCl→ AgCl + HNO
3
Question 24
A gas expands when heated because:
A
Its mass increases
B
Molecules collide less often
C
Molecules move faster and farther apart
D
Pressure drops immediately
Question 25
The value of an equilibrium constant Kc is 1.5×10
5
at 298 K for a certain reaction. What does this indicate about the reaction?
A
Reactant are largely favored
B
Products are significantly favored
C
Reaction is slow
D
Reaction is at completion
Question 26
In an electrochemical cell, the reducing agent is found:
A
At the anode where reduction occurs span>
B
At the cathode where oxidation occurs
C
At the anode where oxidation occurs
D
In the salt bridge
Question 27
Which of the following compounds is an isomer of but-1-ene?
A
Butan-2-ol
B
But-2-ene
C
Ethyne
D
Cyclobutane
Question 28
The electrical conductivity of graphite arises from:
A
Delocalized л-electrons between layers
B
Free movement of ions
C
Presence of metal atoms in the lattice
D
Weak van der Waals forces
Question 29
Aldehydes differ from ketones in their:
A
Ability to form hydrogen bonds
B
Reaction with sodium metal
C
Tendency to undergo further oxidation
D
Ability to dissolve in water
Question 30
The acidity of carboxylic acids is primarily due to:
A
The carbonyl group
B
The ability of the molecules to form esters
C
Resonance stabilization of the carboxylate anion
D
Their hydrogen bonding
Question 31
A sample of 5.6g of a gas occupies 2.24dm
3
at STP. What is its relative molecular mass?
A
22
B
44
C
28
D
56
Question 32
2Cl− ═ Cl
2(g)
+ 2e
−
(aq)
.s
Which compound of chlorine acts both as an oxidizing and reducing agent?
A
NaCl
B
NaClO
C
HClO
3
D
Cl
2
Question 33
The maximum oxidation state of chlorine in its oxoacids is exhibited in:
A
HCl
B
HClO
C
HClO
4
D
HClO
4
Question 34
SO
3
34. Which statement is correct about sulphur trioxide above?
A
. It is a basic oxide
B
. It reacts with water to form H
2
S
C
It reacts violently with water to form H
2
SO
4
D
it sublimes easily to form sulphur
Question 35
Which of the following nitrogen oxides is a neutral oxide?
A
NO
B
N
2
SO
4
C
NO
2
D
N
2
O
3
Question 36
Which of the following describes the nature of the bond in the ammonium ion (NH
+
4
)?
A
One covalent and three coordinate bonds
B
Four covalent bonds
C
Two covalent and two dative bonds
D
One dative bond and three covalent bonds
Question 37
Which of the following organic compounds will decolorize both bromine water and acidified KMnO
4
?
A
Benzene
B
Ethanol
C
Ethene
D
Methane
Question 38
In the blast furnace, carbon monoxide acts as:
A
An oxidizing agent to silica
B
A flux to remove impurities
C
A reducing agent to iron (III) oxide
D
A drying agent for air
Question 39
2SO
4(g)
+ O
2(g)
→ 2SO
3(g)
. In the reaction, the standard heats of formation of SO
4(g)
and SO
3(g)
are -297KJmol
-1
and -396KJmol
-1
respectively. The heat change of the reaction is
A
-99KJmol
-1
B
198KJmol
-1
C
+198KJmol
-1
D
+683KJmol
-1
Question 40
Methylethanoate reacts with ammonia to yield
A
methylamine and ethanol
B
. ethylamine and methanol
C
methanamide and ethanol
D
ethabamide and methanol.
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