2022 WAEC GCE Chemistry (Essay & OBJ) Answers [7th February]
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WAEC GCE JANUARY/FEBRUARY 2022 FREE CHEMISTRY (CHEM) QUESTION AND ANSWER ROOM [PRIVATE CANDIDATES]

Monday, 7th February, 2022
Chemistry 2 (Essay) – 8:30am – 10:30am
Chemistry 1 (Objective) – 10:30am – 11:30pm
Chemistry 3 (Alternative to Practical Work) – 1:00pm – 2:30 pm

A. 2022 WAEC GCE CHEMISTRY ESSAY (THEORY) ANSWERS | 7TH FEBRUARY, 2022

(1ai)
Electrolysis is defined as the chemical decomposition of a substance in its molten form or in solution by the passage of electric current.

(1aii)
The concentration of ion

(1b)
The rate of a chemical reaction is the change in concentration over the change in time and is a metric of the speed at which a chemical reactions occurs.

(1c)
The iodide ions are less electronegative than chloride ions and so they are better reducing agents than chloride ions.

(1di)
3Cl + 6NaOH - -> NaClO₃ + 5NaCl + 3H₂O

(1dii)
Oxidation reaction

(1ei)
CₙH₂ₙ₊₁ COOH = 74
12n +2n +1 +12 +16 +15 +1 =74
14n + 46 =74
14n = 28
n = 2
= CₙH₂ₙ₊₁COOH
= C₂H₄₊₁COOH
= C₂H₅COOH

H H OH
| | |
H - C - C - C =O
| |
H H

(1eii)
Propanoic Acid

(1fi)
This is because of its polarity and ability to form hydrogen bonds therefore it dissolves different molecules.

(1fii)
Sulphur dioxide being a strong reducing agent, reduces the purple coloured solution to form a colourless solution.

(1gi)


(1gii)
Methane

(1giii)
Double decomposition

(1hi)
Solution of silver trioxonitrate(v)

(1hii)
Oxidation reaction

(1i)
The first Ionization of Nitrogen is higher than that of Oxygen because of the inner screening effect in the nucleus of Nitrogen conferring higher Ionization energy.

(1j)
3- Methylpropane


B. 2022 WAEC GCE CHEMISTRY OBJECTIVES (OBJ) ANSWERS | 7TH FEBRUARY, 2022

1-10: ABCBDACBDB
11-20: BAACDBABCA
21-30: DBACAABDDC
31-40: BCBACBBACB
41-50: DBBADABDBB


C. 2022 WAEC GCE CHEMISTRY PRACTICAL ANSWERS | 7TH FEBRUARY, 2022

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