Question

Name the substances which give water
(i)temporary hardness
(ii)permanent hardness
​

Answer 1

temporary hardness

I think so

Answer 2

Temporary hardness is caused by dissolved calcium hydrogencarbonate (which is removed by boiling). Permanent hardness is caused by dissolved calcium sulfate (which is not removed by boiling). ... Ions causing permanent hardness of water can be removed using a water softener, or ion exchange column.