What is the common name of the compound CaOCl₂?

Do basic solutions also have H⁺(aq) ions? If yes, then why are these basic?

Under what soil condition do you think a farmer would treat the soil of his fields with quicklime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

Name the substance which on treatment with chlorine yields bleaching powder.

Name the sodium compound which is used for softening hard water.