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Question (31)

QN007490

The molecular mass of carbon tetrachloride (CCl₄) is:

(A) 154 u
(B) 142 u
(C) 128 u
(D) 98 u

Correct Answer: A

Explanation:

12 + (4 × 35.5) = 154 u

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Question (32)

QN007491

Which statement is true regarding molecular mass?

(A) It applies only to ionic compounds
(B) It is calculated using atomic masses
(C) It depends on pressure
(D) It changes during reaction

Correct Answer: B

Explanation:

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Question (33)

QN007492

The molecular mass of ammonia is greater than:

(A) Hydrogen gas
(B) Methane
(C) Oxygen gas
(D) Carbon dioxide

Correct Answer: A

Explanation:

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Question (34)

QN007493

Which compound has molecular mass 32 u?

(A) O₂
(B) CO₂
(C) H₂O
(D) NH₃

Correct Answer: A

Explanation:

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Question (35)

QN007494

The molecular mass of hydrogen chloride (HCl) is:

(A) 35.5 u
(B) 36.5 u
(C) 37.5 u
(D) 38.5 u

Correct Answer: B

Explanation:

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Question (36)

QN007495

Which covalent compound contains atoms of three elements?

(A) CO₂
(B) NH₃
(C) H₂SO₄
(D) CH₄

Correct Answer: C

Explanation:

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Question (37)

QN007496

Molecular mass calculations require knowledge of:

(A) Atomic masses
(B) Colour of compounds
(C) Boiling point only
(D) Density only

Correct Answer: A

Explanation:

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Question (38)

QN007497

Which molecule has molecular mass 17 u?

(A) NH₃
(B) CH₄
(C) H₂O
(D) CO₂

Correct Answer: A

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Question (39)

QN007498

The molecular mass of sulfur trioxide (SO₃) is:

(A) 48 u
(B) 64 u
(C) 80 u
(D) 96 u

Correct Answer: C

Explanation:

32 + (3 × 16) = 80 u

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Question (40)

QN007499

Which compound has molecular mass closest to 100 u?

(A) H₂O
(B) CO₂
(C) PCl₃
(D) NH₃

Correct Answer: C

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