What is the common name of the compound $CaOCl_2$?

Metal compound $A$ reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

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

What will happen if a solution of sodium hydrogencarbonate is heated? Give the equation of the reaction involved.

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

Write word equations and then balanced chemical equations for the reactions taking place when:
$(a)$ Dilute sulphuric acid reacts with zinc granules.
$(b)$ Dilute hydrochloric acid reacts with magnesium ribbon.