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Question (21)

QN007480

The molecular mass of sulfur dioxide (SO₂) is:

(A) 32 u
(B) 48 u
(C) 64 u
(D) 80 u

Correct Answer: C

Explanation:

32 + (2 × 16) = 64 u

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Question (22)

QN007481

The molecular mass of a compound depends upon:

(A) Number and masses of constituent atoms
(B) Shape of molecule
(C) Colour of substance
(D) Physical state only

Correct Answer: A

Explanation:

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Question (23)

QN007482

Which gas has molecular mass 44 u?

(A) Hydrogen
(B) Nitrogen
(C) Carbon dioxide
(D) Oxygen

Correct Answer: C

Explanation:

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Question (24)

QN007483

The molecular mass of water vapour remains:

(A) Less than liquid water
(B) More than liquid water
(C) Same as liquid water
(D) Zero

Correct Answer: C

Explanation:

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Question (25)

QN007484

Which formula has molecular mass 34 u?

(A) H₂S
(B) NH₃
(C) CH₄
(D) O₂

Correct Answer: A

Explanation:

(2 × 1) + 32 = 34 u

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Question (26)

QN007485

The molecular mass of ozone (O₃) is:

(A) 32 u
(B) 48 u
(C) 64 u
(D) 96 u

Correct Answer: B

Explanation:

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Question (27)

QN007486

Which compound has molecular mass 18 u?

(A) CH₄
(B) H₂O
(C) NH₃
(D) O₂

Correct Answer: B

Explanation:

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Question (28)

QN007487

The sum of atomic masses in one molecule gives:

(A) Valency
(B) Atomic number
(C) Molecular mass
(D) Mass number

Correct Answer: C

Explanation:

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Question (29)

QN007488

The molecular mass of phosphorus trichloride (PCl₃) is:

(A) 106.5 u
(B) 137.5 u
(C) 154.5 u
(D) 168.5 u

Correct Answer: B

Explanation:

31 + (3 × 35.5) = 137.5 u

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Question (30)

QN007489

Which compound has the smallest molecular mass?

(A) H₂
(B) O₂
(C) CO₂
(D) NH₃

Correct Answer: A

Explanation:

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