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2024 NECO CHEMISTRY PRACTICAL QUESTIONS AND ANSWERS:
NECO 2024 Update
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2024 NECO CHEMISTRY OBJ/ ESSAY QUESTIONS AND ANSWERS:
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2024 NECO 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 (Ca²âş)
II. Magnesium (Mg²âş)
(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 (CuSOâ.5HâO)
(II) Acidic salt: Ammonium chloride (NHâCl)
(III) Basic salt: Sodium carbonate (NaâCOâ)
(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 XClâ = Molecular mass = Vapour density x 2 = 77 x 2 = 154
Molecular mass of XClâ = 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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2024 NECO CHEMISTRY PRACTICAL QUESTIONS AND ANSWERS:
2024 NECO CHEMISTRY PRACTICAL ANSWERS:
NUMBER 1
Solving/Typing…
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NUMBER 2
Solving/Typing…
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NUMBER 3
(3ai)
I- to avoid the drop of the acid into the burette which will alter the reading
II- to avoid change in concentration and contamination
III- to avoid bubbles in the pipette
(3aii)
This can be done through crystallization. The solution is dissolved, heated to a high temperature and then allowed to cool. During cooling,the sodium chloride crystallized out.
(3bi)
(i)evaporating dish
(ii)Bunsen burner
(3bii)
Solubility
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NECO 2024 PRACTICAL SPECIMEN CHEMISTRY QUESTIONSÂ
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