"a) A white powder is an active ingredient of antacids and is used in the preparation of cakes. Name the compound and state how it is manufactured? Give the chemical equation.

(b) Write an equation to show the effect of heat on this compound."

i) What do you mean by the term hydrated salt? Give two examples of hydrated salts which are white and state their chemical formula. ii) Why is tooth paste used for cleaning teeth?

What is chlor-alkali process? Why is it named so? Write down the reaction involved in this process.

Name the constituents of baking powder and write the function of each constituent of baking powder in cake manufacturing.

A road tanker carrying an acid was involved in an accident, and its content spilled on the road. At the side of the road, iron drain covers began melting and fizzing as the acid ran over them. A specialist was called to see if the acid actually leaked into the nearby river. (a) Explain how the specialist could carry out a simple test to see if the river water contains some acid or not. (b) The word "melting" is incorrectly used in the report. Suggest a better name that should have been used for the same purpose. (c) Explain why drain covers began fizzing as the acid ran over them.