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WAEC GCE 2020 First Series Chemistry { Obj & Essay } Questions And Answers.



2020 WAEC GCE CHEMISTRY OBJ/ESSAY ANSWERS BY EXAMCLASS TEAM.

CHEMISTRY OBJ
1-10:DDDADBBABA
11-20:CDABDCCDDC
21-30: ACDBDCCDAB
31-40: BCADABDBAC
41-50: ABBCCADDAD


ESSAY/THEORY ANSWERS

(1)
(i) Sodium trioxonitrate (v) decahydrate
NaNO₃ . 10H₂O
(ii) Sodium Oxide –> Na₂O
(iii) Potassium tetraoxophospate (v) –> K₃PO₄

(1b)
Products formed are:
– Hydrogen gas (a+ cathode)
– Chlorine gas (a+ anode)

(1ci)
it decrease down the group

(1cii)
As the atomic radius increases down the group the attraction of the positive nucleus of the electron outer most electron, thus the ionization energy decreases

(1di)
Nitrogen and carbon (ii) oxide

(1dii)
it is used to heat furnace

(1diii)
it is a source of nitrogen for the manufacture of ammonia

(1ei)
Sodium hydrogen
– used in qualitative analysis
– Purification of bauxite

(1eii)
Sodium trioxocarbonate (iv)
– Manufacture of glass
– As a water soften

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(2a)
MnO₄⁻ + C₂O₄ + H+ –> Mn²+ Co₂ + H₂O
(i) it must be in acidic medium
(ii)
I : C₂O₄²- — Oxidized (reducing Agent)
II : MnO₄⁻ — Reduced (Oxidizing Agent)
(2iii)
MnO₄⁻ + 8H+ + 5e- –> Mn²+ 4H₂O

(2bi)
– Aeration
– Sedementation
– Filtration
– Chlorination

(2bii)
Filtration the water is passed through a filter bed to remove the remaining fine particles of diot
Chlorination: Chorine is added to water to kill germs



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Updated: January 22, 2020 — 4:22 pm

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