write chemical formulas of all the compounds that formed by the combination of following ions;
Ca2+, K+, Fe3+, Cl​-, SO4 2-

Vaishnavi is correct for all formula except the last one:

Fe3+ and SO42- form Ferric Sulphate,  Fe2(SO4)3

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CaCl2: Calcium chloride
CaSO​4: Calcium Sulphate
KCl: Potassium Chloride 
K2SO4: Potassium Sulphate
FeCl3: Ferric Chloride
Fe2SO4: Ferrous Sulphate
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