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Class 9 Chemistry MCQs (Grade 9) From Textbook

Class 9 Chemistry MCQs – Certification Test 219

Periodicity and Properties MCQ (Question 219) – App & e-Book Download

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MCQ 219: The decrease in the force of attraction between valence electrons and nucleus by inner electrons is called:

  1. screening effect
  2. shielding effect
  3. photoelectric effect
  4. dopler effect

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