The compound which is used as an oxidising agent in many chemical industries is:

When a $pH$ paper is dipped in an aqueous solution,it turns blue. What is the approximate $pH$ value of that solution?

During the preparation of hydrogen chloride gas on a humid day,the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to

Acids do not show acidic behaviour in the absence of water but do so in water. Justify this statement with the help of a chemical equation.

Write the chemical formula of bleaching powder. How is bleaching powder prepared? For what purpose is it used in drinking water?

Which chemical is added by farmers to neutralize the acidic soil?