on treatment with hard water they either form soluble calcium salts or do not react with calcium ion
on treatment with hard water they form soluble calcium salts
on treatment with hard water they form sodium salts
on treatment with hard water they are converted into soaps
on treatment with hard water they form more lather than soaps does
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Detergents are more effective than soaps in hard water because they do not react with the calcium and magnesium ions present in hard water to form scum. Soaps, on the other hand, react with these ions to form an insoluble precipitate known as soap scum, which can stick to fabrics and surfaces, making cleaning difficult¹².
Therefore, the correct answer is **A. on treatment with hard water they either form soluble calcium salts or do not react with calcium ion**. This is because detergents either do not react with the calcium ions in hard water or form soluble salts that do not interfere with their cleaning action..
The correct answer suppose to be option B
Because Detergents are not affected by hard water. They form calcium and magnesium salts which are soluble in water.
A is legit don't forget we have Soapy detergent and soapless detergent.
A has both charactersistics 
Check out a similar question from 1991
One advantages of detergents over soap is that detergents?
A. are easier to maufacture
B. foam more than soap
C. form soluble salts with hard water
D. are able to deter germs more than soap
Answer is formation of soluble salt option C
Same applies to the given question whose answer is
OPTION A
OPTION A
Explanation:
Hard water contains calcium (Ca²⁺) and magnesium (Mg²⁺) ions. Here's how soaps and detergents behave in hard water:
Soaps react with Ca²⁺ and Mg²⁺ to form insoluble scum (calcium/magnesium salts of fatty acids), which reduces lathering and cleaning efficiency.
Detergents, especially synthetic ones (like sulfonates or sulfates), are designed to form soluble salts with these ions or not react at all, meaning they continue to lather and clean effectively in hard water.
So Option A is correct:
"On treatment with hard water they either form soluble calcium salts or do not react with calcium ion."
Would you like a simple comparison table of soaps vs detergents in hard water?
From"CHATGPT"
