Among B2H6, B3N3H6, N2O, N2O4, H2S2O3 and H2S2O8, the total number of molecules containing a covalent bond between two atoms of the same kind is
Fill in the blanks in the following sentences: (i) Two atoms of the same element combine to form a molecule. The bond between them is known as .. bond. (ii) Two chlorine atoms combine to form a molecule. The bond between them is known as.... (iii) In the formation of an oxygen molecule, ... electrons are shared by each atom of oxygen. (iv) In the formation of a N2 molecule, ... electrons are shared by each atom on nitrogen. (v) The number of single covalent bonds in C2H2 molecule are.... (vi) Melting points and boiling points of ionic compounds are generally ... Than those of covalent compounds.