Plaster of Paris should be stored in a moisture-proof container. Explain why?

Q. Plaster of Paris should be stored in a moisture-proof container. Explain why?

Answer: The Plaster of Paris should be stored in a moisture-proof container as it absorbs water from moisture and turn into hard substance (Gypsum) as shown in following chemical equation.

Q. A solution of a substance ‘X’ is used for white washing.
(i) Name the substance ‘X’ and write its formula.
(ii) Write the reaction of the substance ‘X’ named in (i) above with water.
Answer:
(i)The substance ‘X’ which is used in white washing is calcium oxide or quick lime and its formula is CaO.
(ii)The reaction involved is
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