A. Ca²+ and Zn²+
B. Cu²+ and Na+
C. Mg²+ and Ca²+
D. Fe²+ and Na+
E. Zn²+ and Cu²+
Correct Answer:
Option C – Mg²+ and Ca²+
Two metallic ions commonly present in hard water are?
![A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]")
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