WAEC Chemistry Questions and Answers 2024

2022 waec chemistry runz

2024 WAEC Chemistry Expo/Runz: Essay And Obj ANSWERS Now available here.

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LEGIT 2024 WAEC CHEMISTRY RUNZ ESSAY ANSWERS

2022 waec chemistry runz

 

Chemistry+Obj!

1ABACCABBCD

11DCDBCCDCDB

21BDCADAABCA

31CBDCCDCBBD

41CACCCDADCA

 

THEORY TO 2024 WAEC CHEMISTRY RUNZ

(1ai)

According to Lewis, an acid can be defined as a substance that can accept a pair of non-bonding electrons i.e an electron pair acceptor.

 

(1aii)

AlCl₃

 

(1b)

Salting out is a process through which soap is precipitated as a solid from the suspension by adding common salt to the suspension. It is a purification process.

(1f)

They can be differentiated using barium chloride. When barium chloride is added to concentrated H₂SO₄ a white precipitate is formed with concentrated HNO₃

(2ci)

Al₂O₃

(3aiii)

Since the molar mass = 46g/mol

The formula is NO₂

:. 14+(16×2)

14+32 = 46g/mol

:. NO₂

(3bii)

The reaction is different because CCl₄ is an organic substance while SiCl₄ is not.

(3ci)

Extraction of copper

(3cii)

(i) CuSO₄

(ii) CuCl₂

 

2022 waec chemistry runz

(5a)

(i) It melts to clear mobile liquid

(ii) A brownish gas is evolved.

(5bi)

(i) Carbon(ii)oxide

(ii) Lead(ii)oxide

(5bii)

Methane(CH₄)

(5biii)

(i) It leads to erosion

(ii) It causes pollution

(5biv)

This is because it has more surface area than it occupies leading to a faster rate of reaction.

(5bv)

Ammoniacal liquor

(5ci)

When water is added to white anhydrous CuSO₄ it turns blue.

(5cii)

(i) It removes the hardness by precipitating the trioxocarbonate(iv)

(ii) It removes the hardness by removing the calcium or magnesium ion and precipitating trioxocarbonate(iv).

(5ciii)

Ca(HCO₃)₂ → CaCO₃ + H₂O + CO₂

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