A simple chemical problem!
B is correct from the activated carbon to absorb the gas, the early use of the filter gas masks. C silica gel is not anti-oxidation, is moisture absorption
B Proper sodium peroxide can chemically absorb some toxic gases while activated carbon is used for physical adsorption of toxic gases
A wrong. Chlorine water purification is the use of sorghum cunning Gui chen bite into the anchor of the strong oxidizing, alum water is the use of hydrolysis of aluminum hydroxide colloid adsorption suspended solids B correct C silica gel for food water absorption, can not prevent oxidation of D methane chloride Things can not be used as a fireproof material
