# Which of the following cements have highest water solubility?
A. Zinc phosphate
B. Zinc oxide eugenol
C. Zinc silicophosphate
D. Zinc polycarboxylate
The correct answer is C. Zinc silicophosphate.
Of the given choices, ZOE cements have the highest solubility in oral environment. But, water solubility of ZOE is less while that of silicophosphate is quite high. The oral solubility is different from water solubility. This is because the oral environment is mildly acidic while the water is neutral. Thus, in oral environment, ZOE has maximum solubility while in water, silicophosphate has maximum water solubility.
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