(a) Identify the acid and the base whose combination forms the common salt that you use in your food. Write its formula and chemical name of this salt. Name the source from where it is obtained.
(b) What is rock salt? Mention its colour and the reason due to which it has this colour.
OR
What does slaking of lime stand for? Why is there a hissing sound during this process? Write the chemical equation for the reaction involved.