Permanent hardness is removed by:

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

$Ca (OCl) Cl$

$Ca (OH)_{2}$

${Na}_{2} {CO}_{3}$

$2 ({CaSO}_{4}) \cdot H_{2} O$

answer is D.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

The permanent hardness of water is caused by dissolved salts of chlorides and sulfates of calcium and magnesium. Sodium carbonate $({Na}_{2} {CO}_{3})$ reacts with dissolved ions to produce insoluble carbonates that can be removed by filtration. Hence, option D is correct.

Watch 3-min video & get full concept clarity

hear from our champions

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

🔥 Start Your JEE/NEET Prep at Just ₹1999 / month - Limited Offer! Check Now!

Get Expert Academic Guidance – Connect with a Counselor Today!

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET