Besides water, what will paradichlorobenzene, calcium sulfate, and dichloromethane, dissolve in (if they do)?

Answer 1

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Oxygen-containing organics - alcohols, aldehydes, ketones

Answer 2

only CaSO4 does, since it is an ionic, inorganic salt.
all other are organics, meaning they will dissolve in organics- like acetone, methanol, benzene, petrol, ether, and so on