Hard Water Can Be Caused by the Presence of

question 48

Multiple Choice

Hard water can be caused by the presence of

• A) Na⁺ and K⁺.
• B) Ca²⁺, Mg²⁺, Fe³⁺.
• C) Na⁺ and Al³⁺.
• D) K⁺ and Pb²⁺.

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