NECO 2026 Chemistry Questions and Answers for Objectives/Essay (Likely Expo/Runs)

You can Make A1 in NECO Chemistry using the free and simple Chemistry NECO exams tips here. Likely NECO Chemistry Questions and Answers for Objective and Theory exams ( Paper 1 &2) has been provided here for all SSCE candidates.

The National Examination Council, NECO Chemistry exam will take place according to the schedule in the Timetable and all the material needed for the exams will be provided. If you are looking for likely NECO Chemistry expo/ runs, follow the latest news here.

This article also make provision for NECO Chemistry past Questions and Answers for Objectives and Essay for practice purposes. Read below for more details on the Correct NECO SSCE Questions and Answers and PDF Download.

Updates on NECO Chemistry Objectives and Essay Papers (1&2)

The National Examination Council, NECO Chemistry exam booklet will consist of two (2) Sections (paper III and II). Do not open the booklet until you are told to do so. While waiting, write your Name and Examination Number in the spaces provided at the top right-hand corner of this booklet.

Answer Paper III on your objective test answer sheet. Paper III is expected to last for1 hour. On completion of Paper III, the objective test answer sheet will be collected. Candidates will answer Paper II on their answer booklet.

Chemistry Objectives Questions and Answers 2026

NECO Chemistry Past Questions and Answers:

1. Indicate the Group of a Compound with the general formula CnH2n2.

• A. alkanoate
• B. alkane
• C. alkanal
• D. alkene
• E. alkyne

Correct Answer: E (alkyne)

2. The scientist who discovered the zig-zag movement of gas molecules is

• A. Graham
• B. Dalton
• C. Gay Lussac
• D. Brownian
• E. Newton

Correct Answer: D (Brownian)

3. Which of the following gases will bleach moist litmus paper?

• A. HCl
• B. CO₂
• C. Cl₂
• D. N₂O
• E. SO₃

Correct Answer: C (Cl₂)

4. Elements with high ionization energies would——-

• A. have high effective nuclear charges
• B. have large atomic radii
• C. lose electrons easily
• D. have low atomic numbers

Correct Answer: A (have high effective nuclear charges)

5. Which of the following metals does not react with water to produce hydrogen?

• A. Zinc
• B. Potassium
• C. Sodium
• D. Copper

Correct Answer: D (Copper)

6. The bond between NH₃ and H⁺ in NH4⁺ is?

• A. electrovalent
• B. covalent
• C. hydrogen
• D. dative

Correct Answer: D (dative)

7. One of the following standard conditions is not correct about energy changes?

• A. Concentration of solution must be 1 mol/dm3
• B. B. Standard pressure is 1 atm
• C. Standard temperature is 298K
• D. ΔH at 298 K is the activation energy

Correct Answer: D (ΔH at 298 K is the activation energy)

8. The following acids are monobasic EXCEPT

• A. dioxonitrate (Ill) acid
• B. ethanedioic acid
• C.  oxochlorate (I) acid
• D. methanoic acid
• E. hydrobromic acid

Correct Answer: B (ethanedioic acid)

9. Brain tumors can be located by using an isotope of

• A. carbon – 14
• B. iodine 131
• C. technetium 99
• D. uranium235
• E. uranium 238

Correct Answer: C ( technetium 99)]

10. The following equations represent redox reactions EXCEPT

• A. Ba2+(aq) + SO2-4 (aq) → BaSO4(s)
• B. Cl2(g) + 2Br- (aq) → 2CI – (aq) + Br2(g)
• C. Fe2+(aq) + ½ C I2(aq) → Fe3+ (aq) + CI-(aq)
• D. 2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) Sn4+ (aq)
• E. Zn(s) + CU2+(aq) → Zn2+(aq) + CU(s)

Answer: A (Ba2+(aq) + SO2-4 (aq) → BaSO4(s))

11. What volume of carbon (IV) oxide in dm ³ is produced at s.t.p. when 2.50g of CaCO₃ reacts with excess acid according to the following equation? CaCO₃(s) + 2HCI(aq) → CaCl₂(aq) + H₂O(1) + CO₂(g)

[CaCO₂ 100; molar volume of a gas at s.t.p. = 22.4dm ³]

• A. 0.28
• B. 0.56
• C. 2.24
• D. 5.6
• E. 11.2

Answer: B (0.56)

12. Brain tumors can be located by using an isotope of

• A. carbon – 14
• B. iodine 131
• C. technetium 99
• D. uranium235
• E. uranium 238

Answer: C (technetium 99)

13. During the extraction of iron in the blast furnance, slag is produced using

• A. carbon
• B. crylite
• C. limestone
• D. oxygen
• E. sulphur

Answer: C ( limestone)

14. X = – log₁₀ H⁺]

What does X stand for in the expression above?

• A. Degree of acidity
• B. Enthalpy change
• C. Equilibrium constant
• D. Ionic product of water
• E. Solubility product

Answer: A (Degree of acidity)

15. Which of the following gases is absorbed from the air due to photosynthesis?

• A. Carbon (II) oxide
• B. Carbon (IV) oxide
• C. Nitrogen
• D. Noble gases
• E. Oxygen

Answer: B (Carbon (IV) oxide)

16. How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?

• A. 2
• B. 3
• C. 4
• D. 5
• E. 6

Answer: E (6)

17. All the following belong to the same family EXCEPT

• A. glycerol
• B. nylon
• C. perspex polyethene
• D. polyethene
• E. polystyrene

Answer: A (glycerol)

See: NECO Timetable

18. The relationship between equilibrium constant and free energy change is represented as

• A. δ G ° =-nFE °
• B. δG °-RT ln K
• C. δ G °= + RT In k
• D. δG ° = δH – T S
• E. H=TδS

Answer: B (δG °-RT ln K)

19. Which of the following is a solid at room temperature?

• A. Argon
• B. Bromine
• C. Chlorine
• D. Fluorine
• E. Iodine

Answer: E (Iodine)

20. The green house effect is a climatic condition associated with the presence of excess

• A. carbon (II) oxide
• B. carbon (IV) oxide
• C. hydrogen sulphide
• D. nitrogen (II) oxide
• E. oxygen

Answer: B (carbon (IV) oxide)

21. The following are ores of metals EXCEPT

• A. bauxite
• B. dolomite
• C. graphite
• D. haematite
• E. magnetite

Answer: C (graphite)

22. Ptotal = P1 + P2 + P3 +…………. Pn, is an expression of law

• A. Boyle’s
• B. Charles’
• C. Dalton’s
• D. Graham’s
• E. Gay Lussac’s

Answer: C (Dalton’s)

23. The furring of kettles and boilers are caused by

• A. calcium hydroxide
• B. calcium hydrogen trioxocarbonate (IV)
• C. calcium trioxocarbonate (IV)
• D. calcium tetraoxocarbonate
• E. magnesium tetraoxocarbonate (VI)

Answer: C (calcium trioxocarbonate (IV))

24. Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding

• A. covalent
• B. dative
• C. electrovalent
• D. hydrogen
• E. metallic

Answer: C (electrovalent)

25. The Ideal Gas Law is expressed mathematically as

• A. P1 /T1 = P2/T2
• B. P1/V1 = P2V2
• C. PV =nRT
• D. PV =KT
• E. V1/T1 = V2/T2

Answer: C (PV =nRT)

26. Non-polar molecules are held together by

• A. co-ordinate bond
• B. covalent bond
• C. electromagnetic force
• D. hydrogen bond
• E. Van der Waals forces

Answer: E (Van der Waals forces)

27.Which of the following salt solutions will have a pH greater than 7?

• A. NaCl
• B. NaHSO₄
• C. Na₂CO₄
• D. Na₂SO₄
• E. MgCl₂

Answer: C (Na₂CO₄

28. Which of the following metals is NOT extracted by electrolysis?

• A. Aluminium
• B. Calcium
• C. iron
• D. Magnesium
• E. Sodium

Answer: C (iron)

29.What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]

• A. 0.32
• B. 0.64
• C. 3.18
• D. 6.35
• E. 9.65

Answer: A (0.32)

30. How many zones are present in a luminous Bunsen burner flame?

• A. 2
• B. 3
• C. 4
• D. 5
• E. 6

Answer: C (4)

31. When air is passed through alkaline pyrogallol and then lime water, the gases left are

• A. nitrogen and carbon (IV) oxide
• B. nitrogen and noble gases
• C. nitrogen and oxygen
• D. nitrogen, carbon (VI) oxide and noble gases
• E. the noble gases

Answer: B (nitrogen and noble gases)

32. A salt which loses its mass when exposed to air is

• A. deliquescent
• B. effervescent
• C. Efflorescent
• D. fluorescent
• E. hygroscopic

Answer: C (Efflorescent)

Essay Chemistry Questions

The following are the Theory Chemistry Past Questions:

1a. Starting with calcium chloride, describe briefly how a solid sample of calcium trioxocarbonate (IV) can be prepared in the laboratory.

b. With relevant equations outline the procedure for the purification of impure copper.

c. Copper reacts with concentrated trioxonitrate (V) acid: i. write a balanced chemical equation for the reaction;

ii. state what would be observed in the reaction,

iii. state why the copper is oxidized;

Chemistry Expo/Runs

The latest updates on the Likely NECO Chemistry expo/runs will be provided here once available. The National Examination Council, NECO exams is for candidates that are fully prepared. The likely NECO objectives and Theory Expo are to guide you on how to answer the NECO exam Questions.

Tips to Passing Chemistry

1. Pray before the commencement of the NECO Chemistry exams
2. Avoid every disturbance before and during the exams
3. Read the instructions provided on the questions paper accordingly
4. Call the attention of the invigilators where there’s confusion
5. Read the objectives questions at least three times before chosing your answer
6. Start with the Questions you know best on the theory section.
7. Make sure your handwriting are readable
8. Cross-check your work before submitting them.

Those that wish to know more about the National Examination Council, NECO Chemistry, should use the comment section below for questions.

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