Which one of the following is the major cation present in the plasma of blood?
Potassium
Calcium
Magnesium
Sodium
Sodium is the main cation of plasma and Chloride is the main anion. Potassium, calcium and magnesium are present in small amounts.
Select from the following group of these salts which may be dissolved in water to make it hard. (I) Sodium chloride (II) Sodium sulphate (III) Calcium chloride (IV) Calcium sulphate (V) Potassium chloride (VI) Magnesium sulphate