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Which of the following is used for removing permanent hardness of water?
Lime
Washing soda
Bleaching powder
Baking soda
- Option 1: Lime
- Lime is primarily used for softening water by removing temporary hardness, not permanent hardness.
- Option 2: Washing soda (Sodium carbonate)
- Washing soda is effective in removing permanent hardness. It reacts with calcium and magnesium ions to form insoluble carbonates, thus removing them from the water.
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- Option 3: Bleaching powder
- It's used mainly as a disinfectant and bleaching agent, not for removing hardness.
- Option 4: Baking soda (Sodium bicarbonate)
- Baking soda is not used for removing water hardness; it's more common in cooking and as a mild cleaning agent.
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