Chapter 4: Class 9 Chemistry Exam Tests
Class 9 Chemistry MCQs - Chapter 4
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MCQ 16: The period number of 2713Al is
MCQ 17: In periodic table elements with similar valence shell configuration are placed in
MCQ 18: When an electron is added in the valence shell than
MCQ 19: The value of ionization energy
MCQ 20: Groups contain alkaline earth metals are
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