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Question (41)

QN007550

Which ionic compound has formula unit mass 102 u?

(A) Na₂CO₃
(B) Al₂O₃
(C) CaCO₃
(D) KNO₃

Correct Answer: B

Explanation:

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Question (42)

QN007551

Which micro-component promotes reflective scientific thinking?

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

Correct Answer: B

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Question (43)

QN007552

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

(A) Raja Ramanna
(B) Aryabhata
(C) Homi Bhabha
(D) Jagadish Chandra Bose

Correct Answer: A

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Question (44)

QN007553

The formula unit mass of zinc oxide (ZnO) is:

(A) 65 u
(B) 81 u
(C) 97 u
(D) 113 u

Correct Answer: B

Explanation:

65 + 16 = 81 u

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Question (45)

QN007554

Which formula unit contains maximum number of atoms?

(A) NaCl
(B) MgO
(C) Al₂O₃
(D) KCl

Correct Answer: C

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Question (46)

QN007555

Formula unit mass is conceptually similar to molecular mass because both involve:

(A) Electric charges only
(B) Sum of atomic masses
(C) Electron counting only
(D) Atomic numbers only

Correct Answer: B

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Question (47)

QN007556

The formula unit mass of sodium bicarbonate (NaHCO₃) is:

(A) 64 u
(B) 72 u
(C) 84 u
(D) 96 u

Correct Answer: C

Explanation:

23 + 1 + 12 + (3 × 16) = 84 u

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Question (48)

QN007557

Which statement about formula unit mass is conceptually correct?

(A) It depends on pressure
(B) It represents total mass of ions in formula unit
(C) It changes during melting
(D) It measures ionic charge

Correct Answer: B

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Question (49)

QN007558

The formula unit mass of silver nitrate (AgNO₃) is:

(A) 108 u
(B) 154 u
(C) 170 u
(D) 186 u

Correct Answer: C

Explanation:

108 + 14 + (3 × 16) = 170 u

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