UTME 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The flame used by welders in cutting metals is
A. butane gas flame
B. acetylene flame
C. kerosine flame
D. oxy-acetylene flame
E. oxygen flame
Question 2
Reaction of \( X \) with yeast forms the basis of the
A. plaster industry
B. textile industry
C. brewing industry
D. soap industry
Question 3
The diagram shows the energy profile for the reaction \( \mathrm{A} + \mathrm{B} = \mathrm{C} + \mathrm{D} \). From this diagram, it is clear that the reaction is
A. spontaneous
B. isothermal
C. adiabatic
D. exothermic
Question 4
In the purification of town water supply, alum is used principally to
A. kill bacteria
B. control the pH of water
C. improve the taste of the water
D. coagulate small particles of mud.
Question 5
A mixture of common salt, ammonium chloride and barium sulphate can best be separated by
A. addition of water followed by filtration then sublimation
B. addition of water followed by sublimation then filtration
C. sublimation followed by addition of water then filtration
D. fractional distillation
E. fractional crystallation
Question 6
What volume of 0.5 M \( \text{ } \mathrm{H}_{2} \mathrm{SO}_{4} \) will exactly neutralize \( 20 \mathrm{~cm}^{3} \) of 0.1 M NaOH solution?
A. \( 2.0 \mathrm{~cm}^{3} \)
B. \( 5.0 \mathrm{~cm}^{3} \)
C. \( 6.8 \mathrm{~cm}^{3} \)
D. \( 8.3 \mathrm{~cm}^{3} \)
Question 7
A piece of sea shell, when dropped into a dilute solution of hydrochloric acid, produces a colourless, odourless gas which turns clear lime-water milky. The sea shell contains
A. sodium chloride
B. ammonium nitrate
C. calcium carbonate
D. calcium chloride
Question 8
The three dimensional shape of methane is
A. hexagonal
B. trigonal
C. linear
D. tetrahedral
E. cubical
Question 9
Consecutive members of an alkane homologous series differ by
A. CH
B. \( \mathrm{CH}_{2} \)
C. \( \mathrm{CH}_{3} \)
D. \( \mathrm{CnHn} \quad \)
E. \( \mathrm{CnH}_{2 n+2} \)
Question 10
The solubility of \( \mathrm{Na}_{3} \mathrm{AsO}_{4} \left(\mathrm{H}_{2} \mathrm{O}\right)_{12} \) is 38.9 g per \( 100 \mathrm{~g} \mathrm{H}_{2} \mathrm{O} \). What is the mass percentage of \( \mathrm{Na}_{3} \mathrm{AsO}_{4} \) in the ethanol? \( \quad [\mathrm{As}=75, \mathrm{Na}=23, \mathrm{O}=16, \mathrm{H}=1] \)
A. 87.2%
B. 38.9%
C. 19.1%
D. 13.7 %
Question 11
What is the formula of sodium gallate if gallium ( \( \mathrm{Ga} \) ) shows an oxidation number of +3?
A. \( \mathrm{NaGaO}_{3} \)
B. \( \mathrm{Na_2Ga}(OH)_{2} \)
C. \( \mathrm{NaGa}(O_3)_{2} \)
D. \( \mathrm{NaGa}(OH)_{4} \)
Question 12
The boiling points of water, ethanol, toluene and butan-2 ol are 373.0K, 351.3K, 383.6K and 372.5 K respectively. Which liquid has the highest vapour pressure at 323.0 K?
A. Water
B. Toluene
C. Ethanol
D. Butan-2ol
Question 13
In dilute solution the heat of the reaction \( 2 \mathrm{NaOH} + \mathrm{HCl} \rightarrow \mathrm{NaCl} + \mathrm{H}_{2} \mathrm{O} \) is -57.3 kJ. Therefore the heat of the reaction \( 2 \mathrm{NaOH} + \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4} + 2 \mathrm{H}_{2} \mathrm{O} \) is
A. +28.65 kJ
B. -28.65 kJ
C. +57.3 kJ
D. -114.6 kJ
Question 14
\( \begin{array}{ccccccc} & & CH & & & & \\ & & \big| & & & & \\ CH_3 & - & C & - & CH_2 & - & CH_3 \\ & & \big| & & & & \\ & & CH_3 & & & & \end{array} \) The I.U.P.A.C. name for the compound above is
A. is isopropylethene
B. acetylene
C. methylbutane
D. 2-methylbutane
Question 15
Which of the following methods may be used to prepare tritoxonitrate (V) acid (nitric acid) in the laboratory?
A. Heating ammonia gas with tetraoxosulphate (VI) acid
B. Heating ammonium trioxonitrate (V) with tetraoxo-sulphate (VI) acid
C. Heating sodium trioxonitrate (V) with calcium tetraoxosulphate (VI) acid
D. Heating potassium trioxonitrate(V) with calcium hydroxide

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