DTW JAMB CHEMISTRY MOCK EXAM 1(YEAR 2024 Online Classes)

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1. The periodic classification of the elements is an arrangement of the elements in order of their; *

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atomic weights

isotopic weights

molecular weights

atomic numbers

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

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2.2M

1.1M

0.22M

0.11M

3. In the experiment below, the litmus paper will initially *

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be bleached

turn green

turn red

turn blue

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

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Al and Mg

Zn and Fe

Zn and Pb

Pb and H

5. 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 *

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collisions are perfectly elastic

forces of repulsion exist

forces of repulsion and attraction are in equilibrium

collisions are inelastic

6. 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

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I, II, III and IV

I and II only

II only

I, III and IV only

7. Which of the following is correct about the periodic table *

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elements in the same period have the same number of valence electrons

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

elements in the same group have the same number of electron shells

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

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

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hydrolysis

esterification

acidification

saponification

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

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CO₂ and H₂O

NO and H₂O

CO and CO₂

SO₂ and NO

10. The preparation of oxygen by heating KClO₃ in the presence of MnO₂, only moderates the heat needed because the catalyst acts by *

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lowering the pressure of the reaction

increasing the surface area of the reaction

increase the rate of the reaction

lowering the energy barrier of the reaction

11. When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as *

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disintegration

polymerization

cracking

degradation

12. If concentrated sulphuric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mass of carbon. In this reaction, concentrated sulphuric acid is acting as *

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a drying agent

an oxidizing agent

a dehydrating agent

a reducing agent

13. Smoke consists of *

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solid particles dispersed in liquid

solid or liquid particles dispersed in a gas

gas or liquid particles dispersed in liquid

liquid particles dispersed in liquid.

14. In the electrolysis of dilute sulphuric acid using platinum electrodes, the products obtained at the anode and cathodes respectively are: *

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sulphur and hydrogen

hydrogen and oxygen

oxygen and hydrogen

hydrogen and sulphate ions

15. Which of the following will increase the yield of R? *

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using a larger vessel

increasing the temperature

removing S

adding a positive catalyst

16. The mass of silver deposited when a current of 10A passed through a solution of a silver salt for 4830s is *

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108.0g

54.0g

27.0g

13.5g

17. From the reaction below, calculate the standard heat change if the standard enthalpies of formation of CO, H₂O, and CO₂ in KJmol ⁻¹ are -394, -242 and -110 respectively. *

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-282kJmol⁻¹

-42kJmol⁻¹

+42kJmol⁻¹

+262kJmol⁻¹

18. If the electron configuration of an element is 1s² 2s² 2p⁵. What is the valency of the element? *

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19. Which of the following gases can be used for demonstrating the fountain experiments?

i. Nitrogen

ii. ammonia

iii. nitrogen (i) oxide

iv. hydrogen chloride

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i and ii

i and iii

ii. and iv

ii only

20. The coloured nature of transition metal ions are associated with their partially filled *

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f-orbital

s-orbital

p-orbital

d-orbital

21. Which of the following CANNOT be obtained by fractional distillation of petroleum *

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ether

methane

hydrogen

butane

22. Which of the following is used as an antiknock in automobile engines? *

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tetramethylsilane

lead tetraethyl

glycerol

n-heptane

23. The Avogadro number of 24g of magnesium is the same as that of *

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1g of hydrogen molecules

16g of hydrogen molecules

32g of oxygen molecules

35.5g of chlorine molecules

24. In an electrolyte set-up to protect iron from corrosion, the iron is *

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made the cathode

made the anode

used with a metal of lower electropositive potential

initially coated with tin

25. The removal of rust from iron by treatment with tetraoxosulphate (VI) acid is based on the *

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hydrolysis of iron

reaction of acid with base

oxidation of the iron

dehydration of the iron

26. The substance often used for vulcanization of rubber is *

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chlorine

hydrogen peroxide

sulphur

tetraoxosulphate

27. Metals of the first transition series have special properties which are different from those of groups I and II elements because they have partially filled *

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s-orbitals

p-orbitals

d-orbitals

f-orbital

28. A particle that contains 11 protons, 12 neutrons and 10 electrons is probably a *

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neutral non-metal

metallic ion

non-metallic ion

neutral metal

29. A catalyst increases the rate of a chemical reaction by providing a path that *

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raises the activation energy

increases the temperature

lowers the activation energy

increases concentration

30. A metal M displaces zinc from ZCl₂ solution. This shows that *

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electrons flow from zinc to M

M is more electropositive than zinc

M is more electronegative than zinc

zinc is more electropositive than M

31. The substance tat is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is *

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oxygen

chlorine

Nitrogen

hydrogen

32. Hydrogen sulphide gas can act as *

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an oxidizing agent

a dehydrating agent

a bleaching agent

a precipitating agent

33. Which of the following is used as a rocket fuel? *

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HNO₃

CH₃COOH

H₂SO₄

HCl

34. The bleaching action of chlorine is effective due to the presence of *

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hydrogen chloride

water

air

oxygen

35. Mineral acids are usually added to commercial hydrogen peroxide to *

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oxidize it

decompose it

minimize its decomposition

reduce it to water and oxygen

36. Aluminium containers are frequently used to transport trioxonitrate (V) acid because aluminium *

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has low density

does not react with the acid

does not corrode

has a silvery-white appearance

37.Ethyne is passes through a hot tube containing organo-nickel catalyst to produce *

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isopropene

polythene

ehtanol

benzene

38. The process of converting starch to ethanol is *

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cracking

distillation

fermentation

oxidation

39. An endothermic reaction is one during which heat is ___ and can be represented by the symbol _____. Which of the following combination can be used accurately *

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liberated -∆H

liberated +∆H

absorbed -∆H

absorbed +∆H

40. Consider the following exothermic reaction 2SO₂ + O₂ ⇌ 2SO₃ If the temperature of the reaction is reduced from 800°C to 500°C, and no other changes take place, then *

1 point

the reaction rate increases

the concentration of SO₂ decreases

concentration of SO₂ increases

SO₂ gas becomes unreactive.

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