Practice UTME chemistry 2022 Past Questions | Edcrib

Question 1 View Details

The flame used by welders in cutting metals is

A. butane gas flame

B. acetylene flame

C. kerosine flame

Correct D. oxy-acetylene flame

E. oxygen flame

Correct Answer: D

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Question 2 View Details

Consecutive members of an alkane homologous series differ by

A. CH

Correct B. \( \mathrm{CH}_{2} \)

C. \( \mathrm{CH}_{3} \)

D. \( \mathrm{CnHn} \quad \)

E. \( \mathrm{CnH}_{2 n+2} \)

Correct Answer: B

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Question 3 View Details

If an element has the electronic configuration \( I s^{2} s^{2} p^{6} \mathrm{Ss}^{2} \mathrm{Sp}^{4} \), it is

A. a metal

B. an alkaline-earth metal

C. an s-block element

Correct D. a p-block element

E. a transition element

Correct Answer: D

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Question 4 View Details

Some copper(II) sulphate pentahydrate ( \( \mathrm{CuSO}_{4}.5 \mathrm{H}_{2} \mathrm{O} \) ), was heated at \( 120^{\circ} \mathrm{C} \) with the following results: Weight of crucible \( =10.00 \mathrm{~g} \); Weight of crucible + \( \mathrm{CuSO}_{4}.\mathrm{5H}_{2} \mathrm{O}=14.98 \mathrm{~g} \); Weight of crucible + residue \( =13.54 \mathrm{~g} \). How many molecules of water of crystallization were lost? \( [\mathrm{H}=1, \mathrm{Cu}=63.5, \mathrm{O}=16, \mathrm{~S}=32] \)

A. 1

B. 2

C. 3

Correct D. 4

E. 5

Correct Answer: D

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Question 5 View Details

The three dimensional shape of methane is

A. hexagonal

B. trigonal

C. linear

Correct D. tetrahedral

E. cubical

Correct Answer: D

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Question 6 View Details

PASSAGE - P1

Use the following to answer Questions 6-8: 

An unknown organic compound \( X \) has a relative molecular mass of 180. It is a colourless crystalline solid, readily soluble in water. X contains the elements \( \mathrm{C}, \mathrm{H}, \) and \( O \) in the atomic ratio \( 1: 2: 1 \). The compound has a sweet taste and melts on heating. In the presence of yeast and in the absence of air, \( X \) is converted to compound \( Y \) and a colourless gas. Compound \( Y \) reacts with sodium metal to produce a gas \( Z \). which gives a 'pop' sound with a glowing splint. \( Y \) also reacts with ethanoic acid to give a sweet smelling compound W.

Compound W is

A. a soap

B. an oil

C. an alkane

Correct D. an ester

E. sucrose

Correct Answer: D

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Question 7 View Details

PASSAGE - P1

Use the following to answer Questions 6-8: 

An unknown organic compound \( X \) has a relative molecular mass of 180. It is a colourless crystalline solid, readily soluble in water. X contains the elements \( \mathrm{C}, \mathrm{H}, \) and \( O \) in the atomic ratio \( 1: 2: 1 \). The compound has a sweet taste and melts on heating. In the presence of yeast and in the absence of air, \( X \) is converted to compound \( Y \) and a colourless gas. Compound \( Y \) reacts with sodium metal to produce a gas \( Z \). which gives a 'pop' sound with a glowing splint. \( Y \) also reacts with ethanoic acid to give a sweet smelling compound W.

The molecular formula of X is

A. \( \mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11} \)

Correct B. \( \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6} \)

C. \( \mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3} \)

D. \( \mathrm{C}_{2} \mathrm{H}_{14} \mathrm{~A}_{7} \)

E. \( \mathrm{C}_{4} \mathrm{H}_{8} \mathrm{~A}_{4} \)

Correct Answer: B

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Question 8 View Details

PASSAGE - P1

Use the following to answer Questions 6-8: 

An unknown organic compound \( X \) has a relative molecular mass of 180. It is a colourless crystalline solid, readily soluble in water. X contains the elements \( \mathrm{C}, \mathrm{H}, \) and \( O \) in the atomic ratio \( 1: 2: 1 \). The compound has a sweet taste and melts on heating. In the presence of yeast and in the absence of air, \( X \) is converted to compound \( Y \) and a colourless gas. Compound \( Y \) reacts with sodium metal to produce a gas \( Z \). which gives a 'pop' sound with a glowing splint. \( Y \) also reacts with ethanoic acid to give a sweet smelling compound W.

Reaction of \( X \) with yeast forms the basis of the

A. plaster industry

B. textile industry

Correct C. brewing industry

D. soap industry

Correct Answer: C

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Question 9 View Details

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

Correct C. sublimation followed by addition of water then filtration

D. fractional distillation

E. fractional crystallation

Correct Answer: C

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Question 10 View Details

Which of the following relationships between the pressure P, the volume-V and the temperature T, represents an ideal gas behaviour?

A. paVT

B. p TaT/N

C. pTaV

D. pval/T

Correct E. paV/T

Correct Answer: E

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Question 11 View Details

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?

Correct A. \( 2.0 \mathrm{~cm}^{3} \)

B. \( 5.0 \mathrm{~cm}^{3} \)

C. \( 6.8 \mathrm{~cm}^{3} \)

D. \( 8.3 \mathrm{~cm}^{3} \)

Correct Answer: A

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Question 12 View Details

In which of the following reaction does hydrogen peroxide act as a reducing agent?

A. \( \text{H}_2\text{S} + \text{H}_2\text{O}_2 \rightarrow \text{S} + 2\text{H}_2\text{O} \\ \)

B. \( \text{PbSO}_3 + \text{H}_2\text{O}_2 \rightarrow \text{PbSO}_4 + \text{H}_2\text{O} \\ \)

C. \( 2\text{I}^- + 2\text{H}^+ + \text{H}_2\text{O}_2 \rightarrow \text{I}_2 + 2\text{H}_2\text{O} \\\)

Correct D. \( \text{PbO}_2 + 2\text{HNO}_3 + \text{H}_2\text{O}_2 \rightarrow \text{Pb}(\text{NO}_3)_2 + 2\text{H}_2\text{O} + \text{O}_2 \\ \)

Correct Answer: D

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Question 13 View Details

For the reaction \( 2\text{Fe}^{3+} + 2\text{I}^- \rightarrow 2\text{Fe}^{2+} + \text{I}_2 \) which of the following statements is TRUE?

A. Fe is oxidized to \( \mathrm{Fe}^{3+} \)

B. \( \mathrm{Fe}^{3+} \) is oxidized to \( \mathrm{Fe}^{2+} \)

Correct C. \( \text{I}^- \) is oxidized to \( \text{I}_2 \)

D. \( \text{I}^- \) is reduced to \( \text{I}_2 \)

Correct Answer: C

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Question 14 View Details

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

Correct D. exothermic

Correct Answer: D

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Question 15 View Details

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

Correct D. -114.6 kJ

Correct Answer: D

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Question 16 View Details

For the reactions: I. \( \text{Melon oil} + \text{NaOH} \rightarrow \text{Soap} + \text{Glycerol} \) II. \( 3\text{Fe} + 4\text{H}_2\text{O} \rightleftharpoons \text{Fe}_3\text{O}_4 + 4\text{H}_2 \) III. \( \text{N}_2\text{O}_4 \rightleftharpoons 2\text{NO}_2 \) Which of the following statements is true?

A. Each of the three reactions requires a catalyst

Correct B. All the reactions demonstrate Le Chaterlier's principle

C. The presence of a catalyst will increase the yields of the products

D. Increase in presence will result in higher yields of the products in I and II only

Correct Answer: B

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Question 17 View Details

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

Correct 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

Correct Answer: B

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Question 18 View Details

Lime water which is used in the laboratory detection of carbon(IV) oxide is an aqueous solution of

Correct A. \( \mathrm{Ca} (\mathrm{OH})_{2} \)

B. \( \mathrm{CaCO}_{2} \)

C. \( \mathrm{CaHCO}_{2} \)

D. \( \mathrm{CaSO}_{2} \)

Correct Answer: A

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Question 19 View Details

If an excess of a liquid hydrocarbon is poured into a jar of chlorine, and the sealed jar is then exposed for several hours to bright sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone.

A. a polymerization reaction

B. an isomerization reaction

C. an addition reaction

Correct D. a substitution reaction

Correct Answer: D

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Question 20 View Details

The function of conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) in the esterification of ethanoic acid with ethanol is to

A. serve as a dehydrating agent

B. serve as a solvent

Correct C. act as a catalyst

D. prevent any side reaction

Correct Answer: C

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Question 21 View Details

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

Correct C. calcium carbonate

D. calcium chloride

Correct Answer: C

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Question 22 View Details

Which of the following electrodes is used in the electrolysis of bauxite \( \left( \mathrm{Al}_{2} \mathrm{O}_{3} \right) \) in molten cryolite?

A. Steel electrodes

Correct B. Carbon electrodes

C. Mercury electrodes

D. Carbon anode and steel cathode

Correct Answer: B

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Question 23 View Details

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:

Correct A. \( \mathrm{Zn}^{2+} \)

B. \( \mathrm{Ca}^{2+} \)

C. \( \mathrm{Al}^{3+} \)

D. \( \mathrm{Pb}^{2+} \)

Correct Answer: A

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Question 24 View Details

\( \begin{array}{ccccccc} & & CH & & & & \\ & & \big| & & & & \\ CH_3 & - & C & - & CH_2 & - & CH_3 \\ & & \big| & & & & \\ & & CH_3 & & & & \end{array} \) The I.U.P.A.C. name for the compound above is

A. is isopropylethene

B. acetylene

C. methylbutane

Correct D. 2-methylbutane

Correct Answer: D

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Question 25 View Details

Hydrogen is not liberated when trioxonitrate (V) acid reacts with zinc because

A. zinc is rendered passive by the acid

B. hydrogen produced is oxidized to water

Correct C. oxides of nitrogen are produced

D. all nitrates are soluble in water

Correct Answer: C

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UTME 2022 Chemistry | Objective

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