Which of the following is not the application of adsorption?

De-ionisation of water

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Gas masks

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Hygroscopic nature of

C a C l_{2}

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Heterogeneous catalysis

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Solution

The correct option is A De-ionisation of water

Deionized water is water that has all of its mineral ions removed, such as cations like sodium, calcium, and anions like chloride and sulfate. In this process, there is no adhesion or accumulation of adsorbate to the adsorbent. So deionization of water does not involve adsorption.
Hence option A is correct.

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