Class 9 Chemistry e-Book's MCQs - Complete
Atomic Structure Experiments Quiz App Download & e-Book PDF - 41
Apps:
MCQ 41:
Electron revolves around the nucleus in orbits which have
- variable energy
- fixed energy
- infinite energy
- zero energy
b
Class 9 Chemistry App & e-Book Tests PDF Download
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9th Grade Chemistry MCQs eBook Download
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Class 9 Chemistry Quiz with Answers
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