UTME 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Consecutive members of an alkane homologous series differ by
A. CH
B. \( CH_2 \)
C. \( CH_3 \)
D. \( C_nH_n \)
Question 2
The periodic classification of the elements is an arrangement of the elements in order of their
A. atomic weights
B. isotopic weights
C. molecular weights
D. atomic numbers
Question 3
How many atoms are present in 6.0 g of magnesium? \( [Mg=24,Na=6.02\times10^{23} mol^{-1}] \)
A. 1.20 x 10²²
B. 2.41 x 10²²
C. 1.51 x 10²³
D. 3.02 x 10²³
Question 4
Which of the following gases may not be dried with concentrated sulphuric acid?
A. \( Hcl_(g) \)
B. \( NH_3 \)
C. \( Cl_2 \)
D. \( SO_2 \)
Question 5
A balanced chemical equation obeys the law of
A. conservation of mass
B. definite proportions
C. multiple proportions
D. conservation of energy
Question 6
According to the Kinetic Theory, an increase in temperature causes the kinetic energy of particles to:
A. decrease
B. increase
C. be zero
D. remain constant
Question 7
The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxornanganate (VII) solution is
A. \( Na_2SO_4 \)
B. \( Na_2SO_3 \)
C. \( Na_2S \)
D. \( Na_2CO_3 \)
Question 8
What volume of oxygen will remain after reacting 8 cm³ of hydrogen gas with 20 cm³ of oxygen gas?
A. 10 cm³
B. 12 cm³
C. 14 cm³
D. 16 cm³
Question 9
An aqueous solution of a metal salt, M, gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia. Therefore the cation in M is
A. \( Zn^{2+} \)
B. \( Ca^{2+} \)
C. \( Al^{2+} \)
D. \( Pb^{2+} \)
Question 10
Which of the following is an example of a chemical change?
A. dissolution of salt in water
B. rusting of iron
C. melting of ice
D. Separating a mixture by distillation
Question 11
Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure water from a mixture of sand, water and methanoic acid?
A. Fractional distillation
B. Filtration followed by distillation
C. Neutralization with sodium hydroxide followed by distillation
D. Neutralization with sodium hydroxide followed by filtration
Question 12
The number of electrons in the valence shell of an element of atomic number 14 is
A. 1
B. 2
C. 3
D. 4
Question 13
An element used in the production of matches is
A. nitrogen
B. aluminium
C. copper
D. sulphur
Question 14
A substance that is used as a ripening agent for fruits is
A. ethene
B. propane
C. methane
D. butane
Question 15
\(\text{(i) } 3\text{CuO(s)} + 2\text{NH}_3\text{(g)} \to 3\text{Cu(s)} + 3\text{H}_2\text{O(l)} + \text{N}_2\text{(g)} \\ \) \( \text{(ii) } 2\text{NH}_3\text{(g)} + 3\text{Cl}_2\text{(g)} \to 6\text{HCl(g)} + \text{N}_2\text{(g)} \\ \) \(\text{(iii) } 4\text{NH}_3\text{(g)} + 3\text{O}_2\text{(g)} \to 6\text{H}_2\text{O(l)} + 2\text{N}_2\text{(g)} \\ \) The reactions represented by the equations above demonstrate the
A. basic properties of ammonia
B. acidic properties of ammonia
C. reducing properties of ammonia
D. oxidising properties of ammonia

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