The intermolecular forces called hydrogen bonding will not exist between molecules of

Answer : Hydogen bonding will not be observed in Hydrogen molecule ()

Explanation : A Hydrogen bonding occurs only when there is unusually strong dipole-dipole forces that occurs between Hydrogen and highly electronegative atoms in a molecule. They are considered to be weak forces of bonds. It can not be observed in hydrogen molecule, as the bonds in H-H is a covalent bond, which is very strong.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

b. examine and describe cells