UTME 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Synthetic rubber is made by polymerization of
A. 2-methyl buta -1,3-diene
B. 2-methylbut-1,2-diene
C. 2-methyl but-1-ene
D. 2-methyl but-2-ono
Question 2
The products of the thermal decomposition of ammonium trioxonitrate (V) are
A. \( \mathrm{NO}_{2} \) and oxygen
B. \( \mathrm{NH}_{3} \) and oxygen
C. nitrogen and water
D. \( \mathrm{N}_{2}\mathrm{O} \) and water.
Question 3
When steam is passed through red hot carbon, which of the following are produced?
A. Hydrogen, oxygen and carbon(IV) oxide
B. Hydrogen and carbon(IV) oxide
C. Hydrogen and carbon(II) oxide
D. Hydrogen and trioxocarbonate(IV) acid
Question 4
The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain
A. \( CO \text{ and } SO \)
B. \( CO \text{ and } SO_2 \)
C. \( CO, SO \text{ and } SO_3 \)
D. \( CO \text{ and } H_2 \)
Question 5
If \( d \) represents the density of a gas and \( k \) is a constant, the rate of gaseous diffusion \( r \) is related to \( d \) by the equation
A. \( r = kd \)
B. \( r = kd^2 \)
C. \( r = k/d \)
D. \( r = kd^2 \)
Question 6
In the reaction \( \mathrm{CaC}_2(s) + 2 \mathrm{H}_2O \rightarrow \mathrm{Ca(OH)}_2(s) + \mathrm{C}_2H_2(g) \) what is the mass of solid calcium needed to produce \( 1000 cm^3 \) of acetylene gas at S.T.P.?
A. 3.8 g
B. 2.9 g
C. 2.0 g
D. 1.0 g
Question 7
Crude copper can be purified by the electrolysis of \( CuSO_{(aq)} \) if
A. platinum electrodes are used
B. the crude copper is made the anode of the cell
C. the crude copper is made the cathode of the cell
D. crude copper electrodes are used
Question 8
What are the possible oxidation numbers for an element if its atomic number is 17?
A. -1 and 7
B. -1 and 6
C. -3 and 5
D. -2 and 6
Question 9
The energy change accompanying the addition of an electron to a gaseous atom is called
A. first ionization energy
B. second ionization energy
C. electron affinity
D. electronegativity
Question 10
Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the
A. acid
B. ester of alkanoic acid
C. alkali
D. alkanol
Question 11
A palm wine seller stopped a bottle of his palm wine in his stall and after a few hours the bottle exploded. Which of the following equations represents the enzyme's reaction that occurred?
A. \( \mathrm{C}_6\mathrm{H}_{12}\mathrm{O} \rightarrow 2 \mathrm{C}_6\mathrm{H}_{14} + 2 \mathrm{CO} + 2 \mathrm{CO}_2 \)
B. \( \mathrm{C}_6\mathrm{H}_{12}\mathrm{OH} \rightarrow \mathrm{CH}_{2} = \mathrm{CH}_2 + \mathrm{H}_2 \mathrm{O} \)
C. \( \mathrm{C}_6\mathrm{H}_{12}\mathrm{OH} + \) dil \( \mathrm{H}_2\mathrm{SO}_4 \rightarrow \mathrm{C}_2 \mathrm{H}_3\mathrm{O} \)
D. \( \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 \rightarrow \mathrm{C}_2\mathrm{H}_5\mathrm{OH} + \mathrm{CO}_2 \)
Question 12
Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper(I) chloride?
A. \( \mathrm{CH}_3\mathrm{CH} = \mathrm{CHCH} \)
B. \( \mathrm{CH}_{3}\mathrm{C} = \mathrm{CCH} \)
C. \( \mathrm{HC} = \mathrm{C} - \mathrm{CH}_3 \)
D. \( \mathrm{CH}_2 = \mathrm{CH} - \mathrm{CH} = \mathrm{CH}_2 \)
Question 13
A solution of calcium bromide contains \( 20 \text{ } g dm^{-3} \). What is the molarity of the solution with respect to calcium bromide and bromide ions? \([Ca=40, Br=80] \)
A. 0.1
B. 0.1, 0.2
C. 0.1, 0.05
D. 0.05, 0.1
Question 14
The efficiency of petrol as a fuel in high compression internal combustion engines improves with an increase in the amount of
A. branched chain alkanes
B. straight chain alkanes
C. cycloalkanes
D. halogenated hydrocarbons
Question 15
Which of the following physical properties decreases across the Periodic Table?
A. Ionization potential
B. Electron affinity
C. Electronegativity
D. Atomic radius

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