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Question
A white powdery substance having strong smell of chlorine is used for disinfecting drinking water supply at waterworks. Identify the substance. Give its chemical name and write the chemical reaction for its preparation.
Solution
Bleaching powder is a white powder that emits a strong smell of chlorine and is used for disinfecting drinking water supply at waterworks.
The chemical name of bleaching powder is calcium oxychloride (CaOCl2).
The chemical reaction that takes place in its preparation is as follows.
Ca(OH)2 + Cl2 → CaOCl2 + H2O
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NaCl, Ca(OH)2, NaHCO3, NH3, Na2CO3, H2O, Cl2, CO2, CaSO4.2H2O, 2CaSO4.H2O, CaOCl2
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Bleaching powder
The reaction between MnO2 with HCl is depicted in the following diagram. It was observed that gas with bleaching abilities was released.
The chemical reaction between MnO2 and HCl is an example of:
