When lead nitrate solution and potassium chloride solution are mixed, potassium nitrate and a precipitate of lead chloride are formed - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2023 - Paper 1

Lead nitrate is toxic, so the appropriate hazard symbol is the one that indicates toxicity, which is typically represented by a black skull and crossbones on a yellow background. This symbol signifies that lead nitrate poses a health risk and should be handled with caution.