WAEC Chemistry Past Questions & Answers - Page 243

1,211.

Which of the following equations represents a neutralization reaction?

A.

CaCI₂ + 2HCI →CI₂ +CaCI ₂ + H₂O

B.

Na₂O₂ + H₂SO₄ → Na₂SO₄ + H₂O₂

C.

H₂SO₄ + KOH → KHSO₄ + H₂ O

D.

2Na + 2H₂O → 2NaOH + H₂

E.

CuSO₄ + 2NaOH → Cu(OH)₂+ Na₂SO₄

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,212.

A solution of pH 7 is

A.

acidic

B.

neutral

C.

concentrated

D.

dilute

E.

saturated

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,213.

What volume of carbon (lV) oxide is produced at s.t.p. when 2.5g of CaCO₃ reacts with excess acid according to the following equation? CaCO₃ + 2HCI → CaCI2 +H₂O + CO₂ [CaCO₃ = 100; molar volume of a gas at s.t.p = 22.4dm³]

A.

11.20dm³

B.

5.60dm³

C.

2.24dm³

D.

0.56dm³

E.

0.28dm³

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,214.

''Equal volumes of all gases at the same temperature and pressure contain the same number of molecules'' is an expression of

A.

Charles Law

B.

Boyle's Law

C.

Avogadro's Law

D.

Graham's Law

E.

Gay Lussac's Law

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,215.

What is the likely formula of compound formed between element M in group two and element X in group seven?

A.

M₇X₂

B.

M₂X

C.

M₂X₇

D.

MX₂

E.

MX₆

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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