Question

Chemical A is used for water softening to remove temporary hardness.A react with carbonate to generate caustic soda.What is A
1.Gypsum
2.iron
3.oxygen
4.silicon

Answer 1

Chemical A is used for water softening to remove temporary hardness.A react with carbonate to generate caustic soda.What is A
1.Gypsum

Answer 2

2) iron is used in the softening

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