Explain the germicical action of agno3 and hgcl2 2- Why does concentrated hno3 acid stain the kin yellow 3- explain the use of heat as an agent of sterlization. cite examples where heat is used as an agent of sterlization 4- offer an explination why picric acid and tannic cid are used in the treatment of burns . 5- cite some practical applicayions of detnaturation

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