UTME 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Which of the following are structural isomers?
A. Propanoic acid and propan-1,2-diol
B. Propanal and propanone
C. Ethanoic acid and propanoic acid
D. Ethan-1,2-diol and ethanoic acid.
Question 2
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 3
The solubility curve shows the variation of solute concentration with
A. volume
B. temperature
C. vapour density
D. pressure.
Question 4
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 5
The experiment that showed that atoms have tiny, positively-charged nucleus was first carried out by
A. Moseley
B. Rutherford
C. Millikan
D. Dalton
Question 6
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 7
The order in which a mixture of sand, ammonium chloride and sodium chloride can be separated is
A. sublimation → dissolution → filtration → evaporation
B. dissolution → filtration → evaporation
C. filtration → sublimation → evaporation→ dryness
D. dissolution → filtration → sublimation → evaporation
Question 8
A substance that is used as a ripening agent for fruits is
A. ethene
B. propene
C. methane
D. butane
Question 9
\( 5 SO₂(g) + 2 KMnO₄(q) + 2 H₂O(l) → K₂SO₄(q) + 2 MnSO₄(aq) + 2 H₂SO₄(aq) \\ \) In the reaction above, the products give a
A. colourless solution
B. purple precipitate
C. purple solution
D. colourless precipitate.
Question 10
Which of the following is a physical change?
A. Freezing ice-cream
B. dissolving calcium in water
C. Burning kerosine
D. Exposing white phosphorous to air.
Question 11
Which of the allotrope of carbon is a constituent of a lead pencil?
A. Graphite
B. Diamond
C. Lampblack
D. Soot
Question 12
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
Question 13
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 14
Copper metal dissolves in concentrated trioxonitrate(V) acid with the resultant evolution of
A. \( \mathrm{CO}_{2} \)
B. \( \mathrm{SO}_{2} \)
C. \( \mathrm{NO}_{2} \)
D. CO
Question 15
The haloalkanes used in the dry-cleaning industries are
A. trichloroethene and tetrachloroethene
B. chloroethane and dichloroethene
C. trichloromethane and tetrachloromethane
D. chloroethene and dichloroethene

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