The correct option is C 4
The total number of SO2−4 ions present in 1 formula unit of K2SO4.Al2(SO4)3.24H2O=4
We know that ,one formula unit contains 1 mole of atoms, one gram ions equal to 1 mole
So, the total number of gram ions of SO2−4 ions present in 1 gram molecule of K2SO4.Al2(SO4)3.24H2O=4