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Question (11)

QN007520

Formula unit mass is calculated by adding:

(A) Atomic numbers only
(B) Atomic masses of constituent ions
(C) Number of neutrons only
(D) Mass numbers only

Correct Answer: B

Explanation:

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Question (12)

QN007521

The formula unit mass of sodium oxide (Na₂O) is:

(A) 46 u
(B) 62 u
(C) 78 u
(D) 92 u

Correct Answer: B

Explanation:

(2 × 23) + 16 = 62 u

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Question (13)

QN007522

Which ionic compound has formula unit mass 95 u?

(A) MgCl₂
(B) Na₂O
(C) KCl
(D) CaO

Correct Answer: A

Explanation:

24 + (2 × 35.5) = 95 u

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Question (14)

QN007523

The formula unit of ionic compounds represents:

(A) A single molecule
(B) Simplest ratio of ions
(C) Atomic structure only
(D) Electron arrangement only

Correct Answer: B

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Question (15)

QN007524

The formula unit mass of aluminium oxide (Al₂O₃) is:

(A) 75 u
(B) 102 u
(C) 120 u
(D) 135 u

Correct Answer: B

Explanation:

(2 × 27) + (3 × 16) = 102 u

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Question (16)

QN007525

Which statement correctly explains formula unit mass?

(A) It applies only to molecules
(B) It is sum of masses of ions in formula unit
(C) It changes with temperature
(D) It measures density

Correct Answer: B

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Question (17)

QN007526

The formula unit mass of ammonium chloride (NH₄Cl) is:

(A) 35.5 u
(B) 49.5 u
(C) 53.5 u
(D) 71 u

Correct Answer: C

Explanation:

14 + 4 + 35.5 = 53.5 u

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Question (18)

QN007527

Which compound has highest formula unit mass?

(A) MgO
(B) NaCl
(C) CaCl₂
(D) KCl

Correct Answer: C

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Question (19)

QN007528

The formula unit mass of potassium oxide (K₂O) is:

(A) 55 u
(B) 78 u
(C) 94 u
(D) 110 u

Correct Answer: C

Explanation:

(2 × 39) + 16 = 94 u

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Question (20)

QN007529

Formula unit mass of ionic compounds is analogous to:

(A) Atomic number
(B) Molecular mass of covalent compounds
(C) Density
(D) Valency

Correct Answer: B

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Question (11)

Formula unit mass is calculated by adding:

Explanation:

Link:

Question (12)

The formula unit mass of sodium oxide (Na₂O) is:

Explanation:

Link:

Question (13)

Which ionic compound has formula unit mass 95 u?

Explanation:

Link:

Question (14)

The formula unit of ionic compounds represents:

Explanation:

Link:

Question (15)

The formula unit mass of aluminium oxide (Al₂O₃) is:

Explanation:

Link:

Question (16)

Which statement correctly explains formula unit mass?

Explanation:

Link:

Question (17)

The formula unit mass of ammonium chloride (NH₄Cl) is:

Explanation:

Link:

Question (18)

Which compound has highest formula unit mass?

Explanation:

Link:

Question (19)

The formula unit mass of potassium oxide (K₂O) is:

Explanation:

Link:

Question (20)

Formula unit mass of ionic compounds is analogous to:

Explanation:

Link:

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