Why does dry $HCl$ gas not change the colour of the dry litmus paper ?
Plaster of Paris should be stored in a moisture-proof container. Explain why ?
A solution turns red litmus blue, its $pH$ is likely to be
A solution reacts with crushed egg-shells to give a gas that turns lime water milky. The solution contains
Write an equation to show the reaction between Plaster of Paris and water.