by using crisscross rule write the formula for calcium sulphate.
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here is your answer hope you find it useful..the 2+ and 2- ions get cancelled.
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Sulphate ion is bivalent anion (i.e. charge is -2) and is represented as SO4−2 and calcium ion is bivalent cation Ca+2 and by Crisscross method their formula is CaSO4 .
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