Which of the following processes is unsuitable for softening water possessing temporary hardness?

Adding calcium hydroxide

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Filtration

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Boiling

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Distillation

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Solution

The correct option is A Adding calcium hydroxide
If you added calcium oxide to water, it would react and make calcium hydroxide. Calcium hydroxide is produced, however, when calcium oxide is mixed (or slaked) with water. Overall, nothing significant happens when you mic Ca(OH)2 with water, certainly no reaction occurs. So, the correct option is "A" (Adding calcium hydroxide).

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Temporary hardness can be removed by mixing water with slaked lime, this process is known as softening of water.

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