UTME 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In which of the following is the oxidation number of sulphur equal to -2?
A. H₂S
B. SO₃
C. S₈
D. SO₂
Question 2
The type of iron that is best suited for welding, making nails, chains and iron rods is
A. Pig iron
B. Wrought iron
C. Cast iron
D. Iron pyrites
Question 3
A substance that is used as a ripening agent for fruits is
A. ethene
B. propene
C. methane
D. butane
Question 4
In the electrolysis of CuSO₄(aq) using platinum electrodes, the reaction at the anode is
A. \( 4 H⁺ + 4 e⁻ → 2 H₂ \)
B. \( 2 OH⁻ + 2 OH⁻ → 2 H₂O + O₂ \)
C. \( 2 OH⁻ - 2 e⁻ → 2 OH \)
D. \( 4 OH⁻ - 4 e⁻ → 2 H₂O + O₂ \)
Question 5
Which of the following polymers is suitable for packaging and electrical insulation?
A. Polyethene
B. Polystyrene
C. Polyamide
D. Polycarbonate
Question 6
How many hydrogen atoms does a single ring cycloalkane have less than the corresponding open-chain alkane?
A. Two
B. Three
C. Four
D. One
Question 7
The gas that is most useful in protecting humans against solar radiations is
A. chlorine
B. ozone
C. carbon(IV) oxide
D. hydrogen sulphide.
Question 8
A compound gives an orange-red colour to a honluminous flame. This compound is likely to contain
A. Fe
B. Cu
C. Na
D. Ca
Question 9
Ordinary glass is manufactured from silica, CaCO₃ and
A. NaHCO₃
B. K₂SO₄
C. K₂CO₃
D. Na₂CO₃
Question 10
The most important use of hydrogen is in the
A. manufacture of methyl alcohol
B. manufacture of ethyl alcohol
C. hydrogenation of oils
D. manufacture of ammonia
Question 11
Which of the following is used as a rocket fuel?
A. H₂SO₄
B. HCl
C. HNO₃
D. CH₃COOH
Question 12
In the purification of impure samples of ethyl ethanoate synthesized by esterification, concentrated sodium trioxocarbonate (IV) solution is used to remove
A. water
B. basic impurities
C. acidic impurities
D. ethoxyethane.
Question 13
Diffusion is slowest in solid particles than in particles of liquids and gases because
A. solid particles have more kinetic energy than the particles of liquids and gases.
B. solid particles have less kinetic energy than the particles of liquids and gases.
C. solid particles have less restrictions in their movement than liquid and gas particles.
D. the particles in solids are far apart and the cohesive forces between them are negligible.
Question 14
In the equation \( 3 Cu + pHNO₃ → 3 Cu(NO₃)₂ + 4 H₂O + xNO \\ \) , the values of p and x respectively are
A. 8 and 2
B. 6 and 2
C. 2 and 3
D. 1 and 3
Question 15
What is the molar mass of a substance, if 0.4 mole of the substance has a mass of 25.0 g?
A. 6.3 g
B. 40.0 g
C. 62.5 g
D. 2.5 g

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