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JAMB - Chemistry (2019 - No. 52)
The two ions responsible for hardness in water are
Ca\(^{2+}\) and / or Mg\(^{2+}\)
K\(^+\) and / or Mg\(^{2+}\)
Ca\(^{2+}\) and / or Li\(^+\)
Ca\(^{2+}\) and / or Na\(^+\)
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