Final answer:
In answer to the question about the solubility of salts, lead(II) nitrate (Pb(NO3)2) is indeed soluble in water because all nitrates are soluble according to solubility rules.
Step-by-step explanation:
The question asks which of the listed salts is insoluble in water. According to solubility rules, all nitrates are soluble, including salts like Pb(NO3)2 (lead(II) nitrate). However, there are exceptions for other types of salts. For example, halides (chlorides, bromides, and iodides) are generally soluble, except for those combined with silver (Ag+), mercury (Hg22+), and lead (Pb2+). In comparison, most sulfates are soluble, except when paired with barium (Ba2+), strontium (Sr2+), and lead (Pb2+). Given this information, compounds formed with other anions like carbonates (CO32-) and phosphates (PO43-) are typically insoluble, with specific exceptions.
Considering the solubility rules, the answer to the question: "Which of the following salts is insoluble in water?" is E) All of these are soluble in water if the only provided option is C) Pb(NO3)2 (lead(II) nitrate). This is because lead(II) nitrate is a nitrate, and nitrates are universally soluble in water.