What liquid does iron float in? A. In water B. In mercury C. In oil D. In glycerin

The correct answer is b) in mercury. In order to answer this question, you need to compare the densities of the four listed substances with the density of iron (you can use a special table for this). Looking at the values, we learn that only mercury of all the listed substances has a higher density than iron. This indicator for iron is 7.874 g / cm3, and for mercury in the liquid state – 13.6 g / cm3. (for comparison, the corresponding indicator for water is 1 g / cm3).