2025 NECO Chemistry Past Questions

Which of the following is/are TRUE of nuclear fission? I. A heavy nucleus is split into two nuclei of comparable masses II. Two light nuclei are joined together to form a heavier nucleus III. The total mass of the products is less than that of the reactants

1. A.I only
2. B.II only✓ Correct
3. C.III only
4. D.I and III only
5. E.II and III only

Animal charcoal differs from wood charcoal in that it

1. A.has a dark colour
2. B.has a high carbon content✓ Correct
3. C.is a good absorbent
4. D.is crystalline.
5. E.is rich in phosphate content

From the options lettered A - E, choose the one that is the most appropriate interpretation of the expression in italics The coach said that he would infuse new blood into the team in preparation for the next competition. This means that

1. A.members of the team would undergo blood transfusion
2. B.members of the team will be tested to determine their fitness
3. C.new players would be recruited to strengthen the team
4. D.old members of the team" would be served blood tonic to make them perform better✓ Correct
5. E.the coach was not satisfied with the performance of the team

The rate of a chemical reaction is NOT affected by one of these factors

1. A.colour
2. B.concentration
3. C.presence of light
4. D.surface area✓ Correct
5. E.temperature

The type of placentation found in tomato fruit is called

1. A.axile
2. B.bisal✓ Correct
3. C.free central
4. D.marginal
5. E.parietal

The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is

1. A.CH2✓ Correct
2. B.CH3
3. C.C2H2
4. D.C2H4
5. E.C2H6

A piece of stone weights 180 N in air and 150 N in a beaker containing 160 N of methylated spirit. What is the up thrust exerted on the stone?

1. A.50N✓ Correct
2. B.40N
3. C.30N
4. D.20N
5. E.10N

The phenomenon of photoelectric effect is NOT used in

1. A.automatic doors
2. B.bimetallic strip thermometers✓ Correct
3. C.light meters in cameras
4. D.setting off burglar alarms
5. E.sound production from film tracks.

From the words lettered A to E, choose the one that BEST COMPLETES each of the following sentences. I crave your .......... to formally introduce the compere for this august gathering.

1. A.Approval
2. B.co-operation
3. C.indulgence
4. D.permission✓ Correct
5. E.release

A ray of light experiences a minimum deviation when passing through an equilateral triangular glass prism. Calculate the angle of incidence of the ray. [Refractive index of glass = 1.5]

1. A.300.0°✓ Correct
2. B.48.6°
3. C.60.0°
4. D.75.5°
5. E.105.0 °