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

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

You have been provided with three test tubes. One of them contains distilled water,and the other two contain an acidic solution and a basic solution,respectively. If you are given only red litmus paper,how will you identify the contents of each test tube?

Do basic solutions also have $H^+_{(aq)}$ ions? If yes,then why are these basic?

How is the concentration of hydronium ions $(H_3O^+)$ affected when a solution of an acid is diluted?

Which one of the following types of medicines is used for treating indigestion?