Chapter 2: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 2
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MCQ 156: The number and arrangement of electrons in an atom are important because it controls
MCQ 157: The particles which have equal mass are
MCQ 158: The rays that can penetrate into metal are
MCQ 159: The symbol of 'neon gas' is
MCQ 160: At room temperature, ionic bonds are
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