CHEMISTRY 2020 UTME PAST QUESTION
1. Fats and oils are classified as?
A. Hydrocarbonate
B. Alkanoates
C. Alkanils
D. Carbohydrates
2. Ethyne undergoes the following reactions except?
A. Esterification
B. Substitution
C. Addition
D. Polymerization
3. Which of the following sets of elements is arranged in increasing order of first ionization energies?
A. Na, Li, K, Rb
B. Rb, K, Li, Na
C. Li, K, Na, Rb
D. Rb, K, Na, Li
4. If 120cm
3
of distilled water is added to 180cm
3
of 0.50moldm
-3
sodium hydroxide solution, the new concentration is?
A. 0.4 moldm
-3
B. 0.3 moldm
-3
C. 0.2 moldm
-3
D. 0.1 moldm
-3
5. A transition metal would be expected to
A. Form oxides with different formulae
B. Have an atomic structure with an incomplete outermost shell
C. Have oxidizing ability
D. Have low density
6. What is the IUPAC name of KMnO4?
A. Potassium permanganate
B. Potassium tetraoxomanganate
C. Potassium tetraoxomanganate (VII)
D. Potassium tetraoxomanganate (IV)
7. Which of the following is a heavy chemical?
A. Drugs
B. Dyes
C. H
2
SO
4
D. AgNO
3
8. Which of the following are ores of iron? i. Haematite ii. Bauxite iii. Magnetite iv. Cassiterite
A. i & ii
B. i, ii, iii, & iv
C. i & iii
D. i, ii & iii
9. Water molecules are held together by
A. Covalent bond
B. Ionic bond
C. Hydrogen bond
D. Van der Waal forces
10. Which of the following bleaches by oxidation?
A. H
2
S
B. SO
2
C. Cl
2
D. SO
11. What volume of hydrogen gas is produced at s.t.p. when 6.5g of Zinc (Zn = 65) react with excess dilute sulphurc acid?
A. 2.24dm
3
B. 4.48dm
3
C. 8.96dm
3
D. 18dm
3
12. Which of the following can be used to test for the presence of water in the laboratory?
A. Anhydrous calcium chloride
B. Anhydrous copper (II) tetraoxosulphate (VI)
C. Anhydrous potassium chloride
D. Anhydrous calcium oxide
13. The method commonly used in the preparation of insoluble salts is?
A. Neutralization
B. Oxidation
C. Direct combination of constituent elements
D. Double decomposition
14. Which of the following statements is/are true? (i) H
2
SO
4
is a strong electrolyte (ii) CH
3
COOH is a weak electrolyte (iii) Aluminum conducts electricity (iv) C
6
H
12
O
6
is a non-electricity
A. i & ii only
B. i, ii & iii
C. ii & iii
D. i, ii, iii & iv
15. The earthly impurities in iron ore are removed in the blast furnace by reaction represented by the equation
A. C + CO
2
→ 2CO
B. Fe
2
O
3
+ 3CO → 2Fe + 3CO
2
C. CaO + SiO
2
→ 2Fe + 3CO
2
D. C + O
2
→ CO
2
16. The following ate miscible with water except
A. Ethylethanoate
B. Ethanol
C. Ethanoic acid
D. Methanol
17. How many sigma bond are there in a benzene ring?
A. 3
B. 15
C. 12
D. 2
18. If 200cm3 of a gas at s.t.p. has a mass of 0.268g, determine its molar mass
A. 300gmol
-1
B. 200gmol
-1
C. 150gmol
-1
D. 30gmol
-1
19. The substance extensively used in manufacturing photographic chemicals is
A. Aluminum chloride
B. Zinc chloride
C. Silver chloride
D. Mercury chloride
20. For a reaction to occur spontaneously
A. ▲H must be negative
B. ▲G must be negative
C. Entropy must increase
D. There must be a fall in temperature.
21. Which of the following decreases from left to right across the period but increases down the group in the periodic table?
A. Ionization energy
B. Electron affinity
C. Electronegativity
D. Atomic radius
22. What is emitted during the disintegration of barium nucleus as shown by the equation below:
A. Alpha particle
B. Beta particle
C. X- ray
D. Gamma ray
23. Catalytic hydrogenation of oils results in the production of oils results in the production of
A. Soaps
B. Detergents
C. Margarines
D. Alkanes
24. Which of the following will produce nitrogen (IV) oxide and oxygen when strongly heated? i. NaNO3 ii. KNO3 iii. Mg (NO3)2 iv. Pb (NO3)2
A. i & ii
B. iii & iv
C. i, iii & iv
D. i, ii, iii & iv
25. Which of the following molecules is linear?
A. CO
2
B. H
2
O
C. CH
4
D. NH
3
26. Determine the molecular formula of a compound whose vapour density and empirical formula are 90 and CH2O respectively
A. C
4
H
8
O
2
B. C
12
H
22
O
11
C. C
6
H
12
O
6
D. C
2
H
10
O
5
27. The following alloys contain copper except
A. Duralumin
B. Brass
C. Type metal
D. Bronze
28. The products of the electrolysis of dilute sodium chloride solution with platinum electrodes are
A. Hydrogen and oxygen
B. Sodium and chloride
C. Sodium and oxygen
D. Hydrogen and chloride
29. Which of the following properties is not characteristics of electrovalent compounds?
A. Formation of crystalline solids
B. Solubility in polar solvents
C. High vapour pressure
D. Ability to conduct electricity in aqueous solution
30. A current of 4A was passed through copper (II) tetraoxosulphate (VI) solution for one hour. What mass of copper was deposited? [Cu = 64, IF = 96500C].
A. 3.2g
B. 48g
C. 4.8g
D. 6.4g
31. The maximum number of electrons that can be accommodated in the shell having the principal quantum number 3 is?
A. 3
B. 9
C. 18
D. 32
32. Which of the following is thermally stable?
A. Ca(HCO
3
)
2
B. CaCO
3
C. ZnCO
3
D. K2CO
3
33. “The rate of a reaction is proportional to the number of effective collisions occurring per second between the reactants”. This statement is associated with the
A. Kinetic theory
B. Rate law
C. Atomic theory
D. Collision theory
34. The formula (CH
3
)3COH is the of a/an
A. Alkanoc acid
B. Primary alkanol
C. Secondary alkanol
D. Tertiary alkanol
35. The energy required to remove the most loosely bond electron from a gaseous atom is down as the
A. Electron affinity
B. Ionization energy
C. Activation energy
D. Bond dissociation energy
36. What is the molar mass of the alkyne with the formula C
x
H
14
? [H =1, C =12]
A. 96g
B. 86g
C. 110g
D. 92g
37. The alkali metals exhibit similar chemical properties because
A. They have the same number of valence electrons
B. They form crystalline salts
C. They are highly reactive
D. Their salts are water solution
38. A give volume of methane diffuses in 20s. How long will it take the same volume of Sulphur (IV) oxide to diffuse under the same conditions?
A. 5s
B. 20s
C. 40s
D. 60s
39. Helium is preferred to hydrogen in filling balloons because hydrogen is
A. Isotopic
B. Inflammable
C. Diatomic
D. A component of water
40. Benzene produces more soot then ethane on burning because benzene
A. Has a higher degree of unsaturation
B. Has a higher molar mass
C. Is liquid at room temperature
D. Undergoes both substitustion and addition reactions.
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