Mixing an acid and a base (of the same strength and in equal amounts) will result in
a. combustion.
b. acidification.
c. neutralization.
d. intensification.

neutralization

Explanation:

Mixing an acid and a base (of the same strength and in equal amounts) will result in neutralization.

Neutralization is defined as the mixing of acid and base to produce salt and water. Since acid has high concentration, it can only be neutralized by the effect of base of equal strength to produce water (water is a compound of pH of 7).

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

  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-