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NECO 2024 chemistry essay and OBJ answers are now available. If you are writing this subject, here is the 2024 NECO chemistry Questions June/July verified solution. The NECO Economics Exam will commerce on 15th of July, 2024.
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NECO 2024 Update
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NECO 2024 CHEMISTRY OBJ/ESSAY QUESTIONS AND ANSWERS
Papers III & II: Objective & Essay – Chemistry (3 hrs) (10:00 am – 1:00 pm)
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2024 NECO CHEMISTRY OBJ (OBJECTIVE) ANSWERS
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CHEMISTRY OBJ
01-10: BC**********E
11-20: DD**********D
21-30: AC*********AB
31-40: BDC*********B
41-50: CABA*******D
51-60: BBDDC******C
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2024 NECO CHEMISTRY ESSAY (THEORY) ANSWERS
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CHEMISTRY ESSAY
NUMBER 1
(1a)
(i) Hydrogen gas is colorless and odorless.
(ii) Hydrogen is highly flammable, which means it can easily catch fire when exposed to a flame or spark.
(iii) Hydrogen gas has low density, making it lighter than air.
(1b)
(I) Group 17 (halogens)
(II) lodine
(III) lodine
(1ci)
I. Calcium (Ca²⁺)
II. Magnesium (Mg²⁺)
(1cii)
I. lon exchange method
II. Lime-soda method
(1di)
(I) Methyl orange is used in the titration of a strong acid with a strong base.
(II) Phenolphthalein is used in the titration of a strong base with a strong acid.
(1dii)
(I) Hydrated salt: Copper(II) sulfate pentahydrate (CuSO₄.5H₂O)
(II) Acidic salt: Ammonium chloride (NH₄Cl)
(III) Basic salt: Sodium carbonate (Na₂CO₃)
(1ei)
2-methylbutane –> pentane –> 2,2-dimethylpropane
(1eii)
(I) 1-bromo-3-methylbutane
(II) 2-methylpentane
(1eiii)
Benzene is used as a starting material in the production of various important chemicals such as ethylbenzene, cumene, cyclohexane, and nitrobenzene.
(1eiv)
Saponification is a process in which ester molecules are hydrolyzed in the presence of a strong base (such as sodium hydroxide or potassium hydroxide) to form alcohol and the salt of the carboxylic acid.
(1f)
Given, Vapour density = 77
molecular mass of XCl₄ = Molecular mass = Vapour density x 2 = 77 x 2 = 154
Molecular mass of XCl₄ = X + 4(Atomic mass of Cl)
154 = X + 4(35.5)
X = 154 – 142
X = 12
:. The relative atomic mass of X is 12.
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