During the chemical analysis of a living tissue, it is dried and fully burnt to obtain 'ash'. Which of the following elements is recovered in this ash and has the highest percentage weight in the human body among the given options?

Step-by-step solution

When a living tissue is dried and fully burnt, all carbon compounds are oxidised to gaseous forms (such as CO ₂ and water vapour) and escape. The remaining material, called ash, contains inorganic elements. Because Carbon and Hydrogen escape as gases during burning, they are not recovered in the ash, eliminating them as correct choices despite their abundance in living tissue. The ash retains inorganic elements like Calcium and Silicon. According to NCERT data on the elemental composition of the human body, Calcium