According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water?
a- PbCl2
b- RbCl
c- LiCl
d- FeCl2
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To determine which salt is least soluble in water according to the Solubility Guidelines Chemistry Reference Table, you need to refer to the solubility rules provided in the table.
The solubility rules state that all salts containing Group 1 metals (Li, Na, K, Rb, Cs) are soluble in water. So, options b (RbCl) and c (LiCl) are both expected to be soluble in water.
Additionally, the table indicates that chlorides (Cl-) are generally soluble, except for a few exceptions. One of the exceptions stated in the table is lead chloride (PbCl2). Therefore, option a (PbCl2) is likely to be the least soluble in water.
Option d (FeCl2) is not explicitly mentioned in the solubility rules, so we cannot determine its solubility based on the provided information.
Therefore, based on the solubility rules from the referenced table, the salt that is least soluble in water among the given options is PbCl2 (option a).