2022 NECO GCE Chemistry Questions and Answers Expo

2022 NECO GCE Chemistry obj and essay Questions and Answers

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NECO GCE CHEMISTRY OBJ Expo 2022!

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NECO GCE Chemistry questions and answers 2022

(5ai)

(i)Chlorofluorocarbons

(ii) Hydrofluorocarbon

(5aii)

I – C₂H₂OH + H₂SO₄ —>C₂H₅HSO₄ + H₂O

II – C₂H₅HSO₄ —> C₂H₄ +H₂SO₄

(5aiii)

(i) They incompletely filled d-orbitals

(ii) They exhibit variable oxidation state

(5bi)

(i) It is used in making aeroplane parts due to its tensile strength

(ii) It is used in making window frames because it cannot be easily oxidised

(5bii)

A white precipitate is formed with evolution of brown gas

(5biii)

(i) Hydrogen bond

(ii) Covalent bond

(5ci)

(i) Oxidation

(ii) Electrolysis

(5cii)

(i)Temperature

(ii)Concentration

(5ciii)

H₂SO₄ + 2NaOH —> Na₂SO₄ +2H₂O

CaVa/CbVb = Na/NB

Va = CbVbna/Can

Va = 0.1×25×1/0.5×2

Va = 2.5cm³

==============================

(6ai)

Rate of a chemical reaction is defined as the number of moles of reactant converted or product formed per unit time.

(6aii)

Mass of CaCO3 = 3g

Molar mass of CaCO3= 100g/mol

No. of moles = 3/100 = 0.03

Time = 2×60 = 120s

Rate of reaction = No. of moles/Time

= 0.03/120 = 2.5 × 10-⁴

(6aiii)

(i) They are more resistant to corrosion

(ii) They are more durable

(iii) They have lower melting point

(6aiv)

2Pb(NO₃)₂ —> 2PbO + 4NO₂ +O₂

(6bi)

I =Hard water=

(i)It has better taste than soft water

(ii) It can be supplied in lead pipes as it does not dissolve lead

II =Soft water=

(i) It does not deposit scale in boilers and fur in kettles

(ii) It does not waste soap

(6bii)

I – CO

II – SO₂

(6biii)

I – Hardness

II – Lustre appearance

III – Conductivity

IV – Ability to absorb

(6c)

4.3/2.12 = 142+18x/142

2.12(142+18x)/2.12 = 4.3*142/2.12

142+18x = 288

18x = 288-142

x = 146/18

x = 8

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