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Chemistry
Permanent hardness in water cannot be cured by :
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Q. Permanent hardness in water cannot be cured by :
JEE Main
JEE Main 2015
Hydrogen
A
Boiling
48%
B
Ion exchange method
17%
C
Calgon's method
17%
D
Treatment with washing soda
17%
Solution:
Only temporary hardness which is due to $HCO^-_3$ (bicarbonate) ions is removed by boiling.