Question

two salt which are stable to heat and cause permanent hardness of water​

Answer 1

Explanation:

Hard water caused e.g. by dissolved magnesium sulfate or calcium sulfate is permanent hardness because the sulfate salts don't decompose on heating, so, the hardness is NOT removed on boiling the hard water.

Answer 2

Answer:

Chlorides or sulphates of calcium or magnesium

Explanation:

Chlorides or sulphates of calcium or magnesium cause permanent hardness of water. They are also stable to heat exposure.

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