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100 JAMB QUESTIONS ON CHEMISTRY APRIL BATCH 1 AND 2


1. Which of the following is a chemical change?
A. Melting of ice
B. Boiling of water
C. Rusting of iron
D. Breaking of glass
Answer: C

2. What is the oxidation number of sulfur in H₂SO₄?
A. +4
B. +6
C. -2
D. 0
Answer: B

3. Which of the following gases is not a greenhouse gas?
A. CO₂
B. CH₄
C. N₂
D. H₂O vapour
Answer: C

4. Which particle has the same number of protons and electrons but different number of neutrons?
A. Isomer
B. Isotope
C. Ion
D. Molecule
Answer: B

5. What is the molar volume of an ideal gas at STP?
A. 22.4 dm³
B. 24 dm³
C. 1.0 dm³
D. 2.24 dm³
Answer: A

6. Which of the following represents a covalent compound?
A. NaCl
B. MgO
C. H₂O
D. CaCl₂
Answer: C

7. Which of these processes is endothermic?
A. Freezing of water
B. Condensation of steam
C. Dissolution of NH₄Cl in water
D. Combustion of methane
Answer: C

8. What is the pH of a solution with [H⁺] = 1 × 10⁻⁴ mol/dm³?
A. 4
B. 10
C. 7
D. 2
Answer: A

9. What is the IUPAC name of CH₃CH₂OH?
A. Methanol
B. Ethanol
C. Propanol
D. Butanol
Answer: B

10. Which of the following is an alkyne?
A. C₂H₆
B. C₂H₄
C. C₂H₂
D. CH₄
Answer: C

11. What is the main ore of aluminum?
A. Hematite
B. Bauxite
C. Galena
D. Magnetite
Answer: B

12. Which of these elements has the highest electronegativity?
A. Fluorine
B. Oxygen
C. Nitrogen
D. Chlorine
Answer: A

13. What is the formula mass of Na₂CO₃?
A. 106 g/mol
B. 84 g/mol
C. 40 g/mol
D. 23 g/mol
Answer: A

14. What is the oxidation number of Mn in KMnO₄?
A. +2
B. +4
C. +6
D. +7
Answer: D

15. Which of the following is a base?
A. H₂SO₄
B. NaOH
C. HCl
D. CO₂
Answer: B

16. Which of the following shows periodicity?
A. Atomic number
B. Isotopy
C. Mass number
D. Ionization energy
Answer: D

17. Which of the following is not a property of acids?
A. Sour taste
B. Turns blue litmus red
C. Reacts with bases
D. Soapy feel
Answer: D

18. The major constituent of natural gas is:
A. Methane
B. Ethane
C. Butane
D. Propane
Answer: A

19. What is the number of neutrons in ³⁹₁₉K?
A. 20
B. 19
C. 39
D. 58
Answer: A

20. The process of separating liquids with different boiling points is called:
A. Filtration
B. Crystallization
C. Distillation
D. Sublimation
Answer: C

21. What is the shape of the water molecule?

A. Linear
B. Tetrahedral
C. Angular (V-shaped)
D. Trigonal planar
Answer: C

22. Which element forms a basic oxide?
A. CO₂
B. SO₂
C. Na₂O
Did. NO₂
Answer: C

23. The number of unpaired electrons in an oxygen atom is:
A. 0
B. 1
C. 2
D. 4
Answer: C

24. Which of the following has giant covalent structure?
A. NaCl
B. H₂O
C. Diamond
D. CH₄
Answer: C

25. Which of the following gases is monoatomic?
A. O₂
B. N₂
C. Ne
D. Cl₂
Answer: C

26. Which process is used to obtain pure water from salt water?
A. Filtration
B. Decantation
C. Distillation
D. Crystallization
Answer: C

27. Which of these best describes the solubility of gases in water?
A. Increases with temperature
B. Decreases with pressure
C. Increases with pressure
D. Independent of pressure
Answer: C

28. Which of the following undergoes addition reaction?
A. Alkane
B. Alkene
C. Alkyne
D. Aromatic hydrocarbon
Answer: B

29. What is the empirical formula of a compound with 40% C, 6.7% H, and 53.3% O?
A. CHO
B. CH₂O
C. C₂H₄O₂
D. C₆H₁₂O₆
Answer: B

30. The monomer of polyethylene is:
A. Ethene
B. Ethane
C. Propene
D. Methane
Answer: A

31. Which of these metals will not liberate hydrogen from dilute HCl?
A. Zinc
B. Iron
C. Copper
D. Magnesium
Answer: C

32. The device used to measure atmospheric pressure is called:
A. Thermometer
B. Barometer
C. Hygrometer
D. Manometer
Answer: B

33. The compound that decolorizes bromine water is:
A. Ethane
B. Ethene
C. Methane
D. Ethanol
Answer: B

34. What is the major constituent of air by volume?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Argon
Answer: B

35. Which of the following is an amphoteric oxide?
A. Na₂O
B. ZnO
C. CO₂
D. SO₂
Answer: B

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Jamb biology 2025
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(2a)
(i) Communication: Offices facilitate communication within and outside the organization through various channels like email, phone, and meetings.
(ii) Record Keeping: Offices maintain accurate and up-to-date records of transactions, decisions, and activities for future reference.
(iii) Administration: Offices oversee daily operations, ensuring smooth workflow, productivity, and efficient use of resources.
(iv) Decision Making: Offices provide a platform for decision-making, problem-solving, and strategic planning.
(v) Representation: Offices represent the organization to clients, customers, and stakeholders, projecting a professional image.

(2b)
(i) Current accounts are designed for business transactions, while savings accounts are for personal savings and investments.
(ii) Savings accounts typically earn interest, while current accounts may have lower or no interest rates.
(iii) Savings accounts often have withdrawal limits, while current accounts usually don't have such restrictions.
(iv) Current accounts often require a minimum balance to avoid maintenance fees, while savings accounts may have lower or no minimum balance requirements.
(v) Current accounts are designed for frequent transactions, while savings accounts are meant for less frequent transactions.

(3a)
(i) Bearer Cheque: A cheque payable to anyone who presents it, without specifying a particular payee.
(ii) Post-Dated Cheque: A cheque with a future date, which can't be cashed until that date, allowing the issuer to delay payment.
(iii) Stale Cheque: A cheque that's not presented for payment within a reasonable time (usually 6 months), which may not be honored by the bank.

(3b) Information on Trading Documents
(i) Catalogue:
a. Product descriptions and specifications
b. Prices and discounts
c. Images or illustrations
(ii) Order:
a. Customer information (name, address, contact details)
b. Product details (quantity, description, price)
c. Delivery instructions
(iii) Invoice:
a. Invoice number and date
b. Customer information (name, address)
c. Total amount due, including taxes and discounts

(3c)
(i) Debit Note: To notify a customer of an amount owed due to errors, returns, or additional charges.
(ii) Credit Note: To notify a customer of a credit due to returns, refunds, or overpayment.

(4a)
(i) Fast and reliable delivery, ensuring timely arrival of packages.
(ii) Tracking and security features, providing peace of mind and minimizing losses.
(iii) Convenience and flexibility, allowing customers to choose delivery options and schedules.
(iv) Wide coverage area, enabling delivery to various locations.

(4b)
(i) Effective communication, fostering open dialogue and transparency.
(ii) Training and development programs, enhancing skills and knowledge.
(iii) Recognition and reward systems, motivating employees and boosting morale.
(iv) Team-building activities, promoting collaboration and camaraderie.
(v) Feedback mechanisms, allowing employees to share concerns and suggestions.

(5a)
(i) Human error, such as negligence or distraction.
(ii) Equipment failure, due to poor maintenance or design flaws.
(iii) Poor working conditions, including inadequate lighting, ventilation, or safety measures.
(iv) Lack of training or supervision, leading to inadequate knowledge or skills.

(5b)
(i) Protecting employees' physical and mental well-being.
(ii) Reducing accidents and injuries, minimizing downtime and costs.
(iii) Improving productivity and morale, enhancing job satisfaction and engagement.
(iv) Complying with regulatory requirements, avoiding fines and penalties.

(6a)
(i) Facilitates decision-making, enabling collective input and consensus.
(ii) Encourages collaboration and discussion, fostering teamwork and idea-sharing.
(iii) Builds team spirit and communication, promoting unity and cooperation.
(iv) Provides a platform for informatio
n-sharing, updates, and announcements.

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