6.Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 gm. Molar atomic mass of Magnesium is 24 gm/mol. 7.Write postulates of Daltion's atomic theory (at least three).

CBSE MCQs on Class 9 Science Chapter 2: Is Matter Around Us Pure are quite useful for the upcoming annual exams as these questions will help students familiarise themselves with all important concepts ...