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The electronic configurations of two met...

The electronic configurations of two metals X and Y are 2, 8, 2 and 2, 8, 8, 2 respectively. What is the effect of the presence of hydrogen carbonate and sulphates of these metals in water?

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Elements X and Y are Mg and Ca, respectively. Hydrogen carbonates or bicarbonates of Ca and Mg impart temporary hardness while sulphates of Ca and Mg impart permanent hardness to water.
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