Welcome to “Naijaclass Academy“ For Neco GCE 2025 Chemistry Questions Answers Expo

If you’re preparing for the NECO GCE 2025 Exam, this updated guide from Naijaclass.com will help you score high with verified questions and solved answers.

 

Thursday 11 December
Chemistry III (Objective) – 10:00 am – 11:30 am
Chemistry II (Essay) – 11:30 am – 1:00 pm

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What to Expect in NECO GCE 2025 Chemistry Practical

The practical exam usually contains three compulsory questions:

1. Volumetric Analysis (Titration)

2. Qualitative Analysis (Salt Analysis)

3. Identification & Test of Organic Compounds or Physical Properties

Below are the most accurate predictions for the NECO GCE 2025 Chemistry Practical with detailed answers.

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1. NECO GCE 2025 Chemistry Practical Specimens (Likely)

Students will likely work with the following specimens:

Volumetric Analysis

• Solution A: Standard acid (e.g., HCl or H₂SO₄)

• Solution B: Sodium hydroxide (NaOH)

• Indicator: Methyl orange or phenolphthalein

• Apparatus: Burette, pipette, conical flask, distilled water

Salt Analysis

• Salt P: May contain Pb²⁺, Fe²⁺, Fe³⁺, Cu²⁺, Ca²⁺, NH₄⁺

• Salt Q: May contain CO₃²⁻, SO₄²⁻, NO₃⁻, Cl⁻

Organic/Physical Test

• Simple test for starch, sugars, alcohol, oil, or unknown solution.

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2. Likely Neco GCE 2025 Chemistry Questions Answers Expo (Solved Answer)

You are provided with:

• Solution A: 0.100 mol/dm³ HCl

• Solution B: NaOH of unknown concentration

• 25 cm³ of B was pipetted into a conical flask and titrated against A.

Titration Table (Correct Format)

Average Titre:

(24.50 + 24.40 + 24.50) ÷ 3 = 24.47 cm³

Calculation of Concentration of NaOH (B)

Equation:
HCl + NaOH → NaCl + H₂O (1:1)

Using the formula:

CAVA=CBVBC_A V_A = C_B V_BCA