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Because it has very high thermal capacity (meaning it absorbs lots of heat), but it's dangerous because if it changes state it can freeze and break the cooling system in winter. (water expands when frozen)
Answer:
Precipitates of BaSO4 will be formed.
Explanation:
Most of the sulphates are soluble but barium sulphate is not soluble, it forms precipitates in the mixture. This reaction is of much industrial importance for production of barium sulphate and is used in paints too.