Show the formation of Aluminium oxide (`Al_2O_3`) by the transfer of electrons.

Show the formation of Calcium chloride ( CaCl_2 ) by the transfer of electrons.

The valency of aluminium in aluminium oxide (Al_2O_3) is

The atomic number of aluminium is 13.What is the number of electrons in Al^3+ ?

Find the oxidation number of (i) Cr in K_2CrO_3

What is the oxidation number of Cr in Cr_2O_7^(2-) ?

What chemical principle is involved in choosing a reducing agent for getting the metal from its oxide ore? Consider the metal oxide Al_2O_3 and Fe_2O_3 and Justifuy the choice of the reducing agent.

Knowing the electron gain enthalphy values for OrarrO^- and O rarrO^2- as -141 and 702 kJ mol^- respectively, how can you account for the formation of a large number of oxides hav-ing O^2- species and not O^- ?

Find out the oxidation number of bromine in Br_3O_8