Exam Body

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UTME 2018 Chemistry | Objective

Are you preparing for UTME exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

A given amount of gas occupies \( 10.0 dm ^3 \) at 4 atm , and \( 273^{\circ} \mathrm{C} \). The number of moles of the gas present is \([\text{Molar Volume of gas at s.t.p =} 22.4dm^3 ]\)

Correct A. 0.89 mol

B. 1.90 mol

C. 3.80 mol

D. 5.70 mol

Correct Answer: A

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Question 2

According to Charles' law, the volume of a gas becomes zero at

A. \( 0^{\circ} \mathrm{C} \)

B. \(-100^{\circ} \mathrm{C} \)

Correct C. \(-273^{\circ} \mathrm{C} \)

D. \(-373^{\circ} \mathrm{C} \)

Correct Answer: C

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Question 3

A substance that is used as a ripening agent for fruits is

Correct A. ethene

B. propane

C. methane

D. butane

Correct Answer: A

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Question 4

The Sulphide which is insoluble in dilute hydrochloric acid is

A. FeS

Correct B. CuS

C. ZnS

D. Na,S

Correct Answer: B

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Question 5

What is the PH of 0.001 moldm? solution of the sodium hydroxide

A. 14

B. \( 13 \quad \)

C. \( 12 \quad \)

Correct D. 11

Correct Answer: D

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Question 6

The type of bonding in \([\mathrm{Cu}(\mathrm{NH}_3)_4]^{2+} \) is

Correct A. coordinate

B. electrovalent

C. metallic

D. covalent.

Correct Answer: A

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Question 7

Which of the following is an example of a chemical change?

A. dissolution of salt in water

Correct B. rusting of iron

C. melting of ice

D. Separating a mixture by distillation

Correct Answer: B

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Question 8

To what temperature must a gas at 273 K be heated in order to double both its volume and pressure?

A. 298 K

B. 546 K

C. 819 K

Correct D. 1092 K

Correct Answer: D

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Question 9

According to the Kinetic Theory, an increase in temperature causes the kinetic energy of particles to:

A. decrease

Correct B. increase

C. be zero

D. remain constant

Correct Answer: B

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Question 10

An element used in the production of matches is

A. nitrogen

B. aluminium

C. copper

Correct D. sulphur

Correct Answer: D

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Question 11

Which of the following gases may not be dried with concentrated sulphuric acid?

A. \( Hcl_(g) \)

Correct B. \( NH_3 \)

C. \( Cl_2 \)

D. \( SO_2 \)

Correct Answer: B

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Question 12

Consecutive members of an alkane homologous series differ by

A. CH

Correct B. \( CH_2 \)

C. \( CH_3 \)

D. \( C_nH_n \)

Correct Answer: B

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Question 13

A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging

Correct A. Al and Mg

B. Zn and Fe

C. Zn and Pb

D. Pb and H

Correct Answer: A

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Question 14

A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that

Correct A. collisions are perfectly elastic

B. forces of repulsion exist

C. forces of repulsion and attraction are in equilibrium

D. collisions are inelastic.

Correct Answer: A

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Question 15

On which of the following is the solubility of a gaseous substance dependent? I. Nature of solvent II. Nature of solute III. Temperature IV. Pressure

A. I, II, III and IV

B. I and II only

C. II only

Correct D. I, III and IV only.

Correct Answer: D

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Question 16

Which of the following statements is correct about the periodic table?

A. Elements in the same period have the same number of valence electrons

Correct B. The valence electrons of the elements in the same period increase progressively across the period.

C. Elements in the same group have the same number of electron shells

D. The non-metallic properties of the elements tend to decrease across each period.

Correct Answer: B

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Question 17

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

Correct D. atomic numbers

Correct Answer: D

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Question 18

If 1 litre of 2.2 M sulphuric acid is poured into a bucket containing 10 litres of water, and the resulting solution mixed thoroughly, the resulting sulphuric acid concentration will be

A. 2.2 M

B. 1.1 M

Correct C. 0.22 M

D. 0.11 M

Correct Answer: C

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Question 19

In the above experiment (Fig. 1) the litmus paper will initially

A. be bleached

B. turn green

C. turn red

Correct D. turn blue

Correct Answer: D

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Question 20

The boiling of fat and aqueous caustic soda is referred to as

A. hydrolysis

B. esterification

C. acidification

Correct D. saponification

Correct Answer: D

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Question 21

Which of the following pairs of substances will react further with oxygen to form a higher oxide?

A. \( CO_2 \) and \( H_2O \)

B. \( NO \) and \( H_2O \)

C. \( CO \) and \( CO_2 \)

Correct D. \( SO \) and \( NO \)

Correct Answer: D

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Question 22

In the preparation of oxygen by heating \( KClO_3 \) in the presence of \( MnO_2 \), only moderate heat is needed because the catalyst acts by

A. lowering the pressure of the reaction

B. increasing the surface area of the reaction

C. increasing the rate of the reaction

Correct D. lowering the energy barrier of the reaction.

Correct Answer: D

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Question 23

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

Correct C. Neutralization with sodium hydroxide followed by distillation

D. Neutralization with sodium hydroxide followed by filtration

Correct Answer: C

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Question 24

A quantity of electricity liberates 3.6 g of silver from its salt. What mass of aluminium will be liberated from its salt by the same quantity of electricity?

A. 2.7 g

B. 1.2 g

C. 0.9 g

Correct D. 0.3 g

Correct Answer: D

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Question 25

Suitable reagents for the laboratory preparation of nitrogen are

Correct A. sodium dioxonitrate (III) and ammonium chloride

B. sodium trioxonitrate (V) and ammonium chloride

C. sodium chloride and ammonium trioxonitrate (V)

D. sodium chloride and ammonium diozonitrate (II, II)

Correct Answer: A

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