30ml of KMnO4 solution of concentration 0.02 mol/l is completely reduced by 20 ml of sodium oxalate solution 1. Calculate the concentration of the sodium oxalate used
2. Calculate the volume of gas released at S. T.P. conditions (Vm=24 l/mol)​

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You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.