Which statements about water are correct?
1 Water is treated with chlorine to kill bacteria.
2 Household water may contain salts in solution.
3 Water is used in industry for cooling.
4 Water for household use is filtered to remove soluble impurities.
1 )
1, 2 and 3
2 )
1 and 4
2, 3 and 4
4 )
1, 2, 3 and 4
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