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).

The Central Board of Secondary Education (CBSE) has announced major changes to the school education system. From the 2026-27 session, the curriculum for classes 9 and 10 will be completely overhauled ...