solution of a substance is used for whitewashing after 2-3 days the solution reacts with carbon dioxide in the air and form the thin layer cube which gives a Shiny finishing to was identified P and Q and also give the equation involved in the above reaction
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Quicklime is used for whitewashing as it produces calcium hydroxide (CaOH) when it reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, as a result, it produces calcium carbonate (CaCO3) which creates a hard coating on the walls.
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