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Batra Sahab
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Asked: 2025-02-01T09:21:07+00:00 In:

Atomic mass of chlorine is

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0%(a) 34.5 u
100%(b) 35.5 u ( 1 voter )
0%(c) 17 u
0%(d) 17.5 u
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The correct answer is: (b) 35.5 u
The atomic mass of chlorine is approximately 35.5 u, which is the weighted average of the isotopes chlorine-35 and chlorine-37. This average accounts for their relative abundance in nature.
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.

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    1. (b) 35.5 u. Chlorine has two isotopes, ³⁵Cl (75%) and ³⁷Cl (25%), and its atomic mass is the weighted average of these isotopes. The calculation gives (35 × 0.75) + (37 × 0.25) = 35.5 u, making 35.5 u the correct atomic mass.

      https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/

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