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Question (41)

QN007500

The unit “u” in molecular mass stands for:

(A) Unified atomic mass unit
(B) Universal number
(C) Unit charge
(D) Unique mass

Correct Answer: A

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Question (42)

QN007501

Which covalent compound has molecular mass 30 u?

(A) NO
(B) O₂
(C) NH₃
(D) CH₄

Correct Answer: A

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Question (43)

QN007502

Which micro-component encourages analytical thinking beyond textbook examples?

(A) Index
(B) Pause and Ponder
(C) Appendix
(D) Glossary

Correct Answer: B

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Question (44)

QN007503

Which Indian scientist mentioned in the chapter is associated with atomic research?

(A) Raja Ramanna
(B) Aryabhata
(C) C. V. Raman
(D) Jagadish Chandra Bose

Correct Answer: A

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Question (45)

QN007504

The molecular mass of carbonic acid (H₂CO₃) is:

(A) 44 u
(B) 52 u
(C) 62 u
(D) 72 u

Correct Answer: C

Explanation:

(2 × 1) + 12 + (3 × 16) = 62 u

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Question (46)

QN007505

Which molecule has maximum molecular mass?

(A) H₂
(B) CO₂
(C) CCl₄
(D) NH₃

Correct Answer: C

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Question (47)

QN007506

Molecular mass helps chemists to:

(A) Identify composition of molecules
(B) Measure electric current
(C) Determine magnetic field
(D) Predict rainfall

Correct Answer: A

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Question (48)

QN007507

The molecular mass of dinitrogen tetroxide (N₂O₄) is:

(A) 76 u
(B) 92 u
(C) 108 u
(D) 124 u

Correct Answer: B

Explanation:

(2 × 14) + (4 × 16) = 92 u

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Question (49)

QN007508

Which statement about molecular mass is conceptually correct?

(A) It changes with physical state
(B) It depends on atomic composition
(C) It is same for all compounds
(D) It measures volume only

Correct Answer: B

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Question (50)

QN007509

The molecular mass of glucose (C₆H₁₂O₆) is:

(A) 120 u
(B) 150 u
(C) 180 u
(D) 210 u

Correct Answer: C

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Question (41)

The unit “u” in molecular mass stands for:

Explanation:

Link:

Question (42)

Which covalent compound has molecular mass 30 u?

Explanation:

Link:

Question (43)

Which micro-component encourages analytical thinking beyond textbook examples?

Explanation:

Link:

Question (44)

Which Indian scientist mentioned in the chapter is associated with atomic research?

Explanation:

Link:

Question (45)

The molecular mass of carbonic acid (H₂CO₃) is:

Explanation:

Link:

Question (46)

Which molecule has maximum molecular mass?

Explanation:

Link:

Question (47)

Molecular mass helps chemists to:

Explanation:

Link:

Question (48)

The molecular mass of dinitrogen tetroxide (N₂O₄) is:

Explanation:

Link:

Question (49)

Which statement about molecular mass is conceptually correct?

Explanation:

Link:

Question (50)

The molecular mass of glucose (C₆H₁₂O₆) is:

Explanation:

Link:

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