Final answer:
The symbol that represents a salt in the options given is d) NaCl, which is sodium chloride, also known as table salt. It consists of a 1:1 ratio of sodium and chloride ions held together by ionic bonds. correct answer is option d.
Step-by-step explanation:
The symbol that represents a salt among the options given is d) NaCl. Sodium chloride, commonly known as table salt, is an ionic compound consisting of sodium ions (Na+) and chloride ions (Cl-). This ionic compound is formed by a 1:1 ratio of sodium and chlorine, which are held together by ionic bonds. Sodium chloride is not only widely used as a seasoning and food preservative but also plays essential roles in industrial processes and biological systems.
Looking at the other options, a) O2 represents a molecule of diatomic oxygen, b) C2H2 is the formula for acetylene, a hydrocarbon, and c) C6H12O6 is glucose, a simple sugar. Therefore, none of these other options represent salts.