In the Calgon process of softening of water, which of the following is used?

Sodium polymetaphosphate

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Hydrated sodium aluminum

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Silicate cation exchange resins

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Anion exchange resins

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Solution

The correct option is A Sodium polymetaphosphate
Sodium hexametaphosphate $N a_{2} [N a_{4} (P O_{3})_{6}]$ is called calgon. It is used to remove hardness of water.
$N a_{2} [N a_{4} (P O_{3})_{6}] + 2 C a^{2 +} \to N a_{2} [C a_{2} (P O_{3})_{6} + 4 N a^{+}$
This reaction takes place when it reacts with hard water.

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