An acid-base neutralization always produces salt and water. Identify the salt that forms when hydrochloric acid and sodium hydroxide react.

HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)

Sodium chloride is the salt that is formed

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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