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

How is bleaching powder prepared? Why does bleaching powder $(i)$ not dissolve completely in water?

In a basic aqueous solution,if the concentration of $[OH^-]$ decreases,what happens to the $pOH$?

$A$ dry pellet of a common base $B$,when kept in open,absorbs moisture and turns sticky. The compound is also a by-product of the chlor-alkali process. Identify $B$. What type of reaction occurs when $B$ is treated with an acidic oxide? Write a balanced chemical equation for one such reaction.

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

How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?