Among these, sodium chloride is a substance which is not a base, therefore option (b) is correct.
A base is a chemical species that donates electrons, accepts protons, or releases hydroxide (OH-) ions in aqueous solution. A base is a molecule or ion able to accept a hydrogen ion from an acid.
A strong base completely dissociates into its ions in water. Bases react vigorously with acids and organic matter. Bases react in predictable ways with pH indicators.
A base substance is a solution that has a pH level of more than 7. Bases react with acids to form salts which is called neutralization reaction.
Among these since sodium chloride is not a base, hence option(b) is correct.
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