The equivalence point in a titration refers to the point when
the ml of the acid equals the ml of the base.
the molarity of the acid used in the reaction equals the molarity of the base used in the reaction.
the number of moles of one reactant reacts completely with the moles of the other reactant.
the acid in the flask turns clear.

the number of moles of one reactant reacts completely with the moles of the other reactant.

Explanation:

At equivalence point the moles of an acid is equal to the moles of a base. Equivalence point is also known as neutralization in an acid base reaction.  

MₐVₐ = MbVb

where Mₐ, Mb, Vₐ and Vb  stand for the molarity of the acid, molarity of the base, volume of the acid and volume of the base respectively.

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.

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

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