Which of these elements is/are the primary component(s) in hard water?
I. Magnesium
II. Iron
III. Calcium
IV. Sodium
A) I only
B) III only
C) II and III
D) I and III
E) II and IV

Question

Quizplus · Accepted Answer

The primary components of hard water are calcium and magnesium. Iron and sodium can also contribute to water hardness, but they are not the primary components.

Which of These Elements Is/are the Primary Component(s) in Hard