Which of these sources of water may likely contain the least concentration of Ca\(^{2+}\) and Mg\(^{2+}\)?

Which of these sources of water may likely contain the least concentration of Ca\(^{2+}\) and Mg\(^{2+}\)?

A Spring water
B River water
C Tap water
D Sea water

jamb 2018 chemistry

The correct answer is C. Tap water

Tap water contains less Ca\(^{2+}\) and Mg\(^{2+}\)

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