<prompt> Gunshot residue on hands can he detected by which test-Benzidine testPhenolphthalein testDermal nitrate testHydrogen activation analysis  <response>: Ans. is c i.e., Dermal nitrate test o Dermal nitrate paraffindiphenylamine test:It is used to detect firearm residues on the hands of the suspectIn this, the hands are coated with a layer of liquid paraffin. After cooling, the casts are removed treated with an acid solution of diphenvlamine, a reagent used to detect nitrates nitrites that originate from gunpowder is deposited on the skin of the person who has fired the shot.A positive test is indicated by the presence of blue flakes in the paraffin.o Benzidine test- most sensitive test for detection of blood,o Phenolphthalein Kastle Mayer test-screening test for blood stainso Harrison Gilroy test hydrogen activation analysis- is used to detect heavy metal. These heavy metals are detected from entrance wound where they are components of the residue discharged from the cartridge of a firearm weapon. 