Answer 1) : The number of ions present in
will have 3 Chloride ions and 1 Gold ion in the molecule.
Explanation : As the compound of
has only one Au atom which is in +3 oxidation state is bonded with 3 Cl atoms which are in (-1) oxidation state. Therefore, as a whole compound it is neutral in ionic charges. This is used as an antimicrobial.
Answer 2) Calcium Sulfate has one calcium ion and one sulfate ion with different ionic charge.
Explanation : As calcium sulfate has the molecular formula
, where one atom of calcium has (+2) charge and one atom of sulfate has (-2) both combine and neutralize the molecule as a whole and form a compound which is used in plaster cast.
Answer 3) Magnesium hydroxide
has one ion of magnesium with (+2) as the ionic charge and two ion of hydroxide which has (-1) charge.
Explanation : In milk of magnesia, the main compound which is magnesium hydroxide has 1:2 ratio of magnesium and hydroxide molecules attached to form a compound. Where magnesium atom is in (+2) state and each of hydroxide ion are in (-1) oxidation state. So,( -1 X 2) = -2 which neutralizes the ionic charge on magnesium ion and stabilizes the compound.