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

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

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.

Why does distilled water not conduct electricity,whereas rain water does?

Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove that they do not show acidic character.

Why do acids not show acidic behaviour in the absence of water?