Q: Which of the following methods can be used for removing permanent hardness of water? I. Treatment with washing soda II. By ion exchange method III. By addition of lime Select the correct answer using the code given below.
(a)I and II
(b)II only
(c)I and III
(d)I only
Correct Answer: (c)
The correct answer is (c): I and III. Subject: Science & Technology | Sub-topic: Chemistry Note: This answer was determined through AI-based research. Verify against the official answer key when available.