Practice — Some Basic Concepts of Chemistry

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CBSE 11 Chemistry
U1
Item 9

Multiple choice·Standard multi-step (3/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

An element has two isotopes of mass numbers

20

and

22

present in equal abundance. Its average atomic mass is

Choose an answer

42.0\text{ u}

20.0\text{ u}

21.0\text{ u}

22.0\text{ u}

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