Write the formula and chemical name of bleaching powder. (ii) Write chemical equation to represent the action of atmospheric CO2 gas on bleaching powder when left exposed in open. (iii) State for what purpose is bleaching powder used in water treatment plants.

(i) Formula and Chemical Name of Bleaching Powder

– Chemical Name: Calcium hypochlorite

– Formula: Ca(OCl)₂

(ii) Chemical Equation for the Action of Atmospheric CO2 on Bleaching Powder

When bleaching powder is exposed to atmospheric carbon dioxide (CO₂), it can react to form calcium carbonate (CaCO₃) and releases chlorine gas (Cl₂). The chemical equation is:

Ca(OCl)₂ + CO₂ → CaCO₃ + Cl₂ + H₂O

(iii) Purpose of Bleaching Powder in Water Treatment Plants

Bleaching powder is primarily used in water treatment plants for disinfection. It helps kill bacteria and other pathogens in water, making it safe for drinking. Additionally, it can also be used to remove unwanted color and odors from water.

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