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State one relevant observation for each ...

State one relevant observation for each of the following :
Anhydrous calcium chloride is exposed to air for sometime

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Anhydrous calcium chloride is exposed to air for some time and it absorbs moisture from air as it has a strong affinity for water.
`CaCl_2 + 2H_2O rarr Ca(OH)_2 + 2HCl`
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