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CHUMPICK QUIZ GAME
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The presence of what salts in water predefines permanent hardness of water? 

А. СаSO4

B. Ca(HCO3)2

C. Mg(HCO3)2

D. K2SO4

E. NaCl

1 Answer

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СаSO4 salts in water predefines permanent hardness of water.

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