♻️WAEC 2025 EXPO CHANNEL {EXAMKEY}♻️
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*JAMB CHEMISTRY PRACTICAL QUESTIONS 2025. Share 09056863938📝 🥰*

1)The knowledge of half-life can be used to
A. Create an element
B. Detect an element
C. to combine elements
D. Irradiate an element

2)An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the
A. law of multiple proportions
B. law of chemical proportions
C. law of simple proportions
D. law of conservation of mass

3)The hydrogen ion concentration of a sample of orange juice is 2.0 X 10−11
moldm−3. What is its pOH? [log102 = 0.3010]
A. 3.30
B. 13.00
C. 10.70
D. 11.30

4)2SO2 (g)+ O2 (g) 2SO3(g) ΔH = -395.7kJmol−1
In the equation, an increase in temperature will shift the equilibrium position to the
A. left and equilibrium constant decreases
B. left and equilibrium constant increases
C. right and equilibrium constant increases
D. right and equilibrium constant decreases

5)The end products of burning a candle in the atmosphere are water and
A. carbon (II) oxide
B. sulphur (IV) oxide
C. carbon (IV) oxide
D. sulphur (VI) oxide

6) The collision theory explains reaction rates in terms of
A. size of the product
B. frequency of collision of the reactants
C. size of reactant
D. frequency of collision of the products

7)The presence of ammonia gas in a desiccator can exclusively be removed by
A. phosphorus (V) oxide
B. fused calcium chloride
C. calcium oxide
D. concentrated tetraoxosulphate (VI) acid

8)Aluminium does not react with either dilute or concentrated trioxonitrate (V) acid because
A. it is insoluble in either dilute or concentrated trioxonitrate (V) acid
B. it is lower than hydrogen in the electrochemical series
C. the reaction with trioxonitrate (V) acid has a light activation energy
D. an insoluble oxide is formed on its surface which renders it passive

9)Which of these sources of water may likely contain the least concentration of Ca2+ and Mg2+?
A. Spring water
B. River water
C. Tap water
D. Sea water

10)The conductivity of an acid solution depends on the
A. amount of ions present and their mobilities
B. mobilities of the ions present
C. amount of ions present
D. temperature of the solution

11)Which of the following metals cannot replace hydrogen from water or steam?
A. Sodium
B. Magnesium
C. Iron
D. Copper

12)Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
A. P will form an electrovalent bond with R
B. Q will form a covalent bond with S
C. R will form an electrovalent bond with S
D. Q will form an electrovalent bond with S

13)During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment
A. the litmus turns blue but no gas is evolved
B. the litmus turns blue and oxygen is evolved
C. the litmus turns blue and hydrogen is evolved
D. the litmus turns red and oxygen is evolved

14)The derivative of benzene that can be used in making explosives is
A. aniline
B. xylene
C. phenol
D. toluene

15)In electrovalency, the oxidation number of the participating metal is always
A. decreasing
B. increasing
C. constant
D. neutral

16)The ionic radii of metals are usuall
A. greater than their atomic radii
B. unaffected by the charge on the ion
C. the same as their atomic radii
D. less than their atomic radii

17)Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]
A. 16
B. 48
C. 40
D. 12

18)Which of these alloys contains copper?
A. solder
B. steel
C. permallory
D. bronze

19)If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density.
A. 196
B. 49
C. 106
D. 82

20)Sieving is a technique used to separate mixtures containing solid particles of
A. small sizes
B. large sizes
C. different sizes
D. the same size

21)3H2(g)+ N2(g)⇔ 2NH3(g) ; H= -ve
In the reaction above, lowering of temperature will
A. have no effect on the equilibrium position
B. increase the rate of both the forward and reverse reactions equally
C. favour the forward reaction
D. favour the reverse reaction
22)The situation obtained when a perfect gas expands into a vacuum is
A. ΔH is positive and TΔ S is zero
B. ΔH is positive and T Δ S is negative
C. ΔH is negative and TΔ S is zero
D. ΔH is zero and T Δ S is positive

23)The general formula of alkanones is
A. RCHO
B. R2
CO
C. RCOOH
D. RCOOR

24)The alkanoic acid found in human sweat is
A. CH3
-COOH
B. CH3
—CH2
—COOH
C. H-COOH
D. CH3

25)The elements in the periodic table are listed in order of increasing
A. relative atomic number
B. atomic mass
C. relative isotopic mass
D. nuclear charge

26)H2 S(g)+ Cl2(g)→ 2HCl(g)+ S(g)
In the reaction above, the substance that is reduced is
A. H2
S
B. S
C. HCl
D. Cl2

27)Which of the compounds is composed of Al, Si, O and H?
A. Elson salt
B. Limestone
C. Clay
D. Urea

28)When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as
A. disintegration
B. polymerization
C. cracking
D. degradation

29)In the removal of water hardness, permutit is regenerated with a strong solution of
A. NaOH
B. Na3
SO4
C. Na3
CO3
D. NaCl

30)A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by
A. boiling the water
B. adding excess calcium hydroxide
C. adding a calculated amount of calcium hydroxide
D. adding sodium carbonate

31)Which of the following separation techniques can be employed in obtaining solvent from its solution?
A. Evaporation
B. Distillation
C. Filtration
D. Precipitation

32)In the upper atmosphere, the ultra-violet light breaks off a free chlorine atom from chlorofluorocarbon molecule. The effect of this is that the free chlorine atom will
A. be very reactive and will attack ozone
B. be non-reactive and will not attack ozone
C. not change the level of ozone in the atmosphere
D. increase the level of ozone in the atmosphere

33)A given amount of gas occupies 10.0dm\(^3\) at 4atm and 273°C. The number of moles of the gas present is?
[Molar volume of gas at s.t.p = 22.4dm\(^3\)]
A. 0.89 mol
B. 1.90 mol
C. 3.80 mol
D. 5.70 mol

34)According to Charles' law, the volume of a gas becomes zero at
A. 0°C
B. -100°C
C. -273°C
D. -373°C

35)A substance that is used as a ripening agent for fruits is
A. ethene
B. propane
C. methane
D. butane

36)The Sulphide which is insoluble in dilute hydrochloric acid i
A. FeS
B. CuS
C. ZnS
D. Na2S

37)What is the PH of 0.00 1 moldm\(^3\) solution of the sodium hydroxide
A. 14
B. 13
C. 12
D. 11

38)The type of bonding in [Cu(NH\(_3\))\(^4\)(^{2+}\) is
A. coordinate
B. electrovalent
C. metallic
D. covalent

39)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

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

A. 298K
B. 546K
C. 819K
D. 1092K




*JAMB CHEMISTRY PRACTICAL ANSWERS BY 09056863938 📝🥰*


1. B. Detect an element
2. A. law of multiple proportions
3. B. 13.00
4. A. left and equilibrium constant decreases
5. C. carbon (IV) oxide
6. B. frequency of collision of the reactants
7. D. concentrated tetraoxosulphate (VI) acid
8. D. an insoluble oxide is formed on its surface which renders it passive
9. A. Spring water
10. A. amount of ions present and their mobilities
11. D. Copper
12. A. P will form an electrovalent bond with R
13. D. the litmus turns red and oxygen is evolved
14. D. toluene
15. B. increasing
16. A. greater than their atomic radii
17. B. 48
18. D. bronze
19. B. 49
20. C. different sizes
21. C. favour the forward reaction
22. D. ΔH is zero and T Δ S is positive
23. B. R2 CO
24. B. CH3 —CH2 —COOH
25. D. nuclear charge
26. A. H2 S
27. C. Clay
28. C. cracking
29. D. NaCl
30. C. adding a calculated amount of calcium hydroxide
31. B. Distillation
32. A. be very reactive and will attack ozone
33. A. 0.89 mol
34. C. -273°C
35. A. ethene
36. C. ZnS
37. A. 14
38. A. coordinate
39. B. rusting of iron
40. B. 546K
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Update 🔥

NABTEB releases Nov/Dec 2024 examination results.

For NABTEB token 👇👇

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WAEC 2025 MIDNIGHT QUESTION AND ANSWER  PAYMENTS!!!.

ALL SUBJECTS(COURSES)+PRACTICAL : ₦16,500
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ALL SCIENCE SUBJECTS : ₦8,000
==========================

ALL ART SUBJECTS : ₦7,000
=======================

ALL COMMERCIAL SUBJECTS : ₦ 7,000
==============================

PAY INTO THE ACCOUNT BELOW
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Update 🔥

For Waec 2025 Candidates 👇👇

This is to inform the general public, particularly students, that the West African Examinations Council (WAEC) has officially released the timetable for the 2025/2026 WAEC May/June examination session.

The WAEC 2025/2026 Examination is scheduled to commence on Tuesday, 30th April 2025, and will conclude on Monday, 24th June 2025.

This timetable pertains to the forthcoming West African Senior School Certificate Examination (WASSCE) for school candidates across The Gambia, Liberia, Nigeria, and Sierra Leone.
WAEC 2025 MIDNIGHT QUESTION AND ANSWER  PAYMENTS!!!.

ALL SUBJECTS(COURSES)+PRACTICAL : ₦16,500
======================================

ALL SCIENCE SUBJECTS : ₦8,000
==========================

ALL ART SUBJECTS : ₦7,000
=======================

ALL COMMERCIAL SUBJECTS : ₦ 7,000
==============================

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