Which of the following oxides is amphoteric?

Which of the following processes occur during fractional distillation of petroleum?

If the molar mass of X(HCO3)\(_{2}\) is 162 g mol\(^{-1}\), determine the relative atomic mass of X.
[H = 1.0, C = 12.0, 0 = 16.0]

Charcoal is used in the decolourization of sugar because of its

The first definition of an element was made by