UTME Past Questions
Chemistry · 2023
40 questions
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Question 01
Which of the following elements will exhibit the most electronegative character?
A
Al
B
Si
C
P
D
S
Question 02
Acid hydrolysis of nitriles will yield?
A
Alkanes
B
Aldehydes
C
Carboxylic acid
D
Alcohols
Question 03
How many isomers of C4H9OH will be tertiary alkanol?
A
1
B
2
C
3
D
4
Question 04
Which of the following makes oils distinguished from fats?
A
Oil contains a higher proportion of unsaturation.
B
Fats contain a higher proportion of unsaturation.
C
Oil and fats have the same proportion of unsaturation
D
Neither oil nor of unsaturation
Question 05
The characteristic crystalline shape of solid water is due to:
A
Covalent bond
B
Hydrogen bonds
C
Ionic bonds
D
Metallic bonds
Question 06
The chemical formula for laughing gas is:
A
NO
B
NO
2
C
N
2
O
D
N
2
O
5
Question 07
The sulphide used in coating electric fluorescent tubes is:
A
Iron (III) sulphide
B
Sphalerite
C
Zinc sulphide
D
Sulphide mineral
Question 08
Calculate the volume in dm3 of oxygen evolved at s. t. p. when a current of 5A is passed through acidified water for 772s (molar volume of gas at stp. = 22.4 dm3
A
0.056
B
0.224
C
224000
D
56000
Question 09
Hydrogenation of Benzene to cyclohexane is called:
A
Cracking
B
Polymerization
C
Reforming
D
Aromatization
Question 10
The pollutant that contribute to the depletion of the ozone layer is:
A
CF
B
CS
C
CCI
D
CFC
Question 11
What changes sodium hydroxide pellets to liquid?
A
Oxygen
B
Water vapor
C
Carbon
D
Nitrogen
Question 12
The compound used as “antifreeze” in car radiators in cold regions of the world is:
A
Ethanol
B
Ethylene glycol
C
Ethanal
D
Propan-1,2-diol
Question 13
What are the laws that form the general gas equation?
A
Boyle’s and Charles law
B
Boyle’s Charles and Graham’s laws
C
Boyle’s law only
D
Charles and Graham’s law
Question 14
Chlorine, bromine, and iodine resemble each other in that all:
A
Dissolve in alkali
B
Displace each other from solutions of their salts
C
React violently with hydrogen on heating
D
Are electron donors
Question 15
The method suitable for separating suspended particles in liquid is:
A
Decantation
B
Distillation
C
Centrifugation
D
Chromatography
Question 16
A hydrocarbon X has a molar mass of 26 and a carbon atom percentage of 92.3%. What is its molecular formula?
A
C
2
H
2
B
C
2
H
6
C
CH
4
D
C
3
H
8
Question 17
Silica gel, when exposed to air, turns liquid. What kind of substance is it?
A
Deliquescent
B
Hygroscopic
C
Efflorescent
D
Evaporation
Question 18
In an equilibrium reaction, which of the following conditions indicates that the maximum yield of the product will be obtained?
A
Equilibrium constant is very large
B
▲H = T▲S
C
▲H > T▲S
D
Equilibrium constant is less than zero
Question 19
Under high pressure, real gases do not obey gas laws because more energetic
A
Have become more energetic
B
Have become less energetic
C
Have become less in Size
D
Have become larger in size
Question 20
The salt responsible for temporary hardness is:
A
Calcium sulphate
B
Magnesium chloride
C
Calcium bicarbonate
D
Magnesium sulphate
Question 21
Common salt (NaCl) is used to preserve foods. Which of the following properties can be used to determine its purity before use?
A
Solubility in water
B
Melting point
C
Relative density
D
Crystalline nature
Question 22
The rate of a chemical reaction is NOT affected by one of these factors:
A
Color
B
Concentration
C
Presence of light
D
Surface area
Question 23
The functional group represented in the compound above is:
A
Alkanol
B
Alkanal
C
Alkanone
D
Alkanoate
Question 24
On exposure to the atmosphere, a hydrated salt loses its water of cyclization to become anhydrous. This phenomenon is referred to as:
A
Efflorescence
B
Deliquescence
C
Hygroscope
D
Hydrolysis
Question 25
Which of the following statements is true of the electrochemical series?
A
Electropositivity of metals increases down the series
B
Electropositivity of non-metals decreases down the series
C
Electronegativity of non-metals decreases
D
Electropositivity of metals decreases down the series
Question 26
Which of th4e following pairs are both substances deliquescent?
A
CaCl
2
and H
2
SO
4
B
NaOH and MgSO
4
.7H
2
O
C
CaCl
2
and NaOH
D
CuO and NaCl
Question 27
The bond formed between H2O AND H
+
to form the hydroxonium H
3
O
+
is:
A
Dative bond
B
Covalent bond
C
Electrovalent bond
D
Ionic bond
Question 28
Gas molecules are said to be perfectly elastic because:
A
They collide without loss of energy
B
They move about in straight lines
C
The distances between them are negligible
D
The volume occupied by them is negligible
Question 29
A solid that absorbs water from the atmosphere and forms an aqueous solution is:
A
Hydrophilic
B
Efflorescent
C
Deliquescent
D
Hygroscopic
Question 30
Which of the following can undergo both addition reaction and substitution reaction?
A
Benzene
B
Pentane
C
Propane
D
Hexane
Question 31
Naming of the organic compound CH
3
(CH
2
)
4
CH
2
CH
2
NH
2
:
A
Pentane-amine
B
Heptane-amine
C
Hexamine
D
Octane-amine
Question 32
2Cl− ═ Cl
2(g)
+ 2e
−
(aq)
.s
The above half-cell reaction occurring at the anode during the electrolysis of dilute ZnCl2 solution is?
A
Ionization
B
Oxidation
C
Reduction
D
Recombination
Question 33
CHCl
3
+ Cl
2
→ HCl + CCl
4
.
A
An addition reaction
B
A decomposition reaction
C
A substitution reaction
D
A condensation reaction
Question 34
C
x
H
y
+ 4O
2
═ 3CO
2
+ 2H
2
O
The hydrocarbon, CxHy, in the reaction above is?
A
Butene
B
Butane
C
Butyne
D
Butanone
Question 35
One method of driving the position of equilibrium of an endothermic reaction forward is to?
A
Increases temperature at constant pressure
B
Decrease pressure at constant temperature
C
Cool down the apparatus with water
D
Decreases temperature at constant pressure
Question 36
0.92g of ethanol when burned raised the temperature of 50g of water by 28.6k. Calculate the heat of combustion of ethanol. [C = 12, 0 = 16, H = 1, Specific heat capacity of water = 4.2 Jg-1 K-1]
A
+3000 KJmol
-1
B
+300 KJmol
-1
C
-300 KJmol
-1
D
-3000 KJmol
-1
Question 37
The repeating unit in natural rubber is
A
alkyne
B
isoprene
C
n-propene
D
neoprene
Question 38
What current in amperes will deposit 2.7g of aluminum in 2 hours? [Al = 2.7, F = 96500 C mol-1]
A
32
B
8
C
4
D
16
Question 39
Steam changes the color of anhydrous cobalt (II) chloride from
A
Blue to pinks
B
Red to white
C
White to green
D
White to blue
Question 40
Which of the following will change when a catalyst id added to a chemical reaction?
A
The activation energy
B
The potential energy of the reactions
C
The heat of the reaction
D
The potential energy of the product
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