A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’. (a) CaOCl2 (b) Ca (OH)2 (c) CaO (d) CaCO3
Answer. B. CaO CaO substance used in white-washing and is obtained by heating limestone in the absence of air.
cao
C. The chemical substance X used for whitewashing is Calcium oxide, also known as quicklime or burnt lime or lime. Calcium oxide is an alkaline earth flux with the chemical formula CaO.
reaction of water with quicklime
