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Question (11)

QN007470

Which compound has highest molecular mass?

(A) H₂O
(B) NH₃
(C) CO₂
(D) CH₄

Correct Answer: C

Explanation:

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Question (12)

QN007471

The molecular mass of nitric oxide (NO) is:

(A) 28 u
(B) 30 u
(C) 32 u
(D) 44 u

Correct Answer: B

Explanation:

14 + 16 = 30 u

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Question (13)

QN007472

Which atom contributes maximum mass in carbon dioxide?

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

Correct Answer: B

Explanation:

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Question (14)

QN007473

The molecular mass of hydrogen gas (H₂) is:

(A) 1 u
(B) 2 u
(C) 4 u
(D) 8 u

Correct Answer: B

Explanation:

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Question (15)

QN007474

If atomic mass of carbon is 12 u and oxygen is 16 u, molecular mass of CO is:

(A) 12 u
(B) 16 u
(C) 28 u
(D) 44 u

Correct Answer: C

Explanation:

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Question (16)

QN007475

Which statement correctly explains molecular mass?

(A) It depends on colour of compound
(B) It is sum of masses of constituent atoms
(C) It measures volume of molecules
(D) It changes with temperature

Correct Answer: B

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Question (17)

QN007476

The molecular mass of ethane (C₂H₆) is:

(A) 24 u
(B) 28 u
(C) 30 u
(D) 32 u

Correct Answer: C

Explanation:

(2 × 12) + (6 × 1) = 30 u

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Question (18)

QN007477

Which covalent compound has molecular mass 44 u?

(A) O₂
(B) CO₂
(C) NH₃
(D) CH₄

Correct Answer: B

Explanation:

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Question (19)

QN007478

The molecular mass of carbon monoxide is:

(A) 12 u
(B) 16 u
(C) 28 u
(D) 44 u

Correct Answer: C

Explanation:

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Question (20)

QN007479

Which compound contains maximum number of hydrogen atoms?

(A) H₂O
(B) NH₃
(C) CH₄
(D) CO₂

Correct Answer: C

Explanation:

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