Salt is the product formed by a reaction in which atoms of an acid are replaced by the atoms
of a metal.
a. carbon
b. hydrogen
c. oxygen
d. nitrogen

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2