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).

Important questions for CBSE Class 9 Science are provided here to help students prepare chapter-wise questions of 2, 3 and 4 marks for the upcoming Term 2 Exam. All questions are prepared by the exam ...