An element Z has a combining power of 3. Which of the following formulae is correct of its compounds?
Answer Details
The correct formula for the compound of element Z would be Z2O3. This is because Z has a combining power of 3, meaning that it can form compounds by bonding with three other elements. In Z2O3, each Z atom is bonded to three O atoms, satisfying Z's combining power of 3. None of the other options satisfy this requirement, as they either have too few or too many atoms of Z.