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Question (21)

QN007381

Which formula is correct for magnesium hydroxide?

(A) MgOH
(B) Mg(OH)₂
(C) Mg₂OH
(D) Mg₂(OH)₃

Correct Answer: B

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Question (22)

QN007382

The valency of sulfate ion (SO₄) is:

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: B

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Question (23)

QN007383

The formula of potassium nitrate is:

(A) KNO₂
(B) K₂NO₃
(C) KNO₃
(D) K₂(NO₃)₂

Correct Answer: C

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Question (24)

QN007384

Which formula contains brackets correctly?

(A) CaOH₂
(B) MgOH₂
(C) Ca(OH)₂
(D) NaOH₂

Correct Answer: C

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Question (25)

QN007385

The valency of phosphate ion (PO₄) is:

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: C

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Question (26)

QN007386

The formula of sodium phosphate is:

(A) NaPO₄
(B) Na₂PO₄
(C) Na₃PO₄
(D) Na₄PO₄

Correct Answer: C

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Question (27)

QN007387

Which pair of ions forms MgCl₂?

(A) Mg⁺ and Cl⁻
(B) Mg²⁺ and Cl⁻
(C) Mg²⁺ and Cl²⁻
(D) Mg⁺ and Cl²⁻

Correct Answer: B

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Question (28)

QN007388

The formula of aluminium sulfate is:

(A) AlSO₄
(B) Al₂(SO₄)₃
(C) Al₃SO₄
(D) Al(SO₄)₂

Correct Answer: B

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Question (29)

QN007389

Which formula represents zinc oxide?

(A) Zn₂O
(B) ZnO₂
(C) ZnO
(D) Zn₂O₃

Correct Answer: C

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Question (30)

QN007390

The formula of calcium phosphate is:

(A) CaPO₄
(B) Ca₂PO₄
(C) Ca₃(PO₄)₂
(D) Ca(PO₄)₃

Correct Answer: C

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