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chapter 3 of class 9 periodic law chemistry class 9 salient features of long form periodic table f block d block p block s block blocks pinworm seat worm enterobius vermicularis acid and bases chapter 10 chemistry class 10 bronsted-lowry concept of acids and bases h.mosely periodic table chapter 03 chemistry 9 class modren periodic table dobereiner newland mendeleev law of octave law of triad structure of lungs difference between inhalation and exhalation the lungs biology class 10 biology chemistry 10 chapter 10 arrhenius concept of acids and bases chemistry 10 class acids and bases