UTME 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In an exothermic reaction, change in entropy is usually
A. indeterminate
B. positive
C. negative
D. zero
Question 2
The alkanoic acid found in human sweat is
A. \( \mathrm{CH}_{3}-\mathrm{COOH} \)
B. \( \mathrm{CH}_{3}-\left(\mathrm{CH}_{2}\right)_{2}-\mathrm{COOH} \)
C. \( H-COOH \)
D. \( CH, \left(\mathrm{CH}_{2}\right) - COOH \)
Question 3
The reagent that can be used to remove carbon(IV) oxide from air is
A. alkaline pyrogallol
B. anhydrous calcium chloride
C. sodium hydroxide
D. yellow phosphorus
Question 4
The hydrogen ion concentration of a sample of orange juice is \( 2.0 \times 10^{-11} \mathrm{moldm}^{3} \). What is its pOH ? [log, \( 2=0.3010] \)
A. 3.30
B. 13.00
C. 10.70
D. 11.30
Question 5
Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) \( [\mathrm{Ca}=40, \mathrm{C}=12, \mathrm{O}=16] \)
A. 16
B. 48
C. 40
D. 12
Question 6
\( \mathrm{nCH}_{2}=\mathrm{CH}_{2} \quad-\mathrm{CH}_{2}-\mathrm{CH}_{2} \mathrm{n}- \) The equation above illustrates the manufacture of
A. rubber
B. polystyrene
C. polythene
D. polypropylene
Question 7
\( 2 \mathrm{SO}_{2}+\mathrm{O}_{2} \rightleftharpoons 2 \mathrm{SO}_{3} \) \( \Delta H=-395.7 \mathrm{kJmol} \). In the equation above, an increase in temperature will shift the equilibrium position to the
A. left and equilibrium constant decreases
B. left and equilibrium constant increases
C. right and equilibrium constant increases
D. right and equilibrium constant decreases
Question 8
Mixing one part of slaked lime and three parts of sand with water will produce
A. plaster of paris
B. cement
C. white paint
D. mortar
Question 9
Which of the following is used for preserving food?
A. Pentanoic acid
B. Butanoic acid
C. Ethanoic acid
D. Methanoic acid
Question 10
Organic compounds generally in comparison with inorganic compounds have
A. higher melting and boiling points
B. higher melting points and lower boiling points
C. lower melting and boiling points
D. lower melting points and higher boiling points
Question 11
In the electrolysis of dilute copper(II) chloride using copper cathode and carbon anode, the resultant effect on the electrolyte
A. becomes diluted
B. becomes acidic
C. becomes alkaline
D. remains unchanged
Question 12
Which of the following atoms contains the highest number of electrons in the outermost shell?
A. Mg
B. Si
C. F
D. Ne
Question 13
In the diagram above, concentrated tetraoxsulphate(VI) acid is used to
A. dry the gas
B. remove impurities
C. remove acid fumes
D. prevent the sucking back of the gas
Question 14
If the vapour density of an organic compound is 78, calculate its molecular formula
A. \( \mathrm{C}_{6} \mathrm{H}_{6} \)
B. \( \mathrm{C}_{11} \mathrm{H}_{\infty} \)
C. \( \mathrm{C}_{10} \mathrm{H}_{10} \)
D. \( \mathrm{C}_{11} \mathrm{H}_{24} \)
Question 15
A radioactive element weighing 1 kg has a half-life of 100 years, what would be its mass in grams in 300 years
A. 125
B. 500
C. 250
D. 750

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