Sodium hypochlorite (NaClO) can technically be sold in solid form, specifically as anhydrous sodium hypochlorite, but it is highly unstable and poses significant safety risks. This solid form decomposes explosively when subjected to heat or friction, and its stability is further compromised by the presence of carbon dioxide. As a result, solid sodium hypochlorite is not commonly used or available compared to its liquid form, which is more practical for applications such as disinfection and bleaching. The liquid form is favored due to its stability and ease of handling, making it the standard choice in both industrial and household settings.