(C) 7
Sodium chloride (NaCl) is a salt of strong acid (HCl) and strong base (NaOH). Salts of a strong acid and a strong base are neutral with pH value of 7.
Source: Chapter 2, Section 2.4.2
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The key rule to remember: strong acid + strong base → neutral salt (pH = 7). The textbook explicitly states this in Section 2.4.2 and also describes NaCl as a neutral salt in Section 2.4.3. For MCQs like this, eliminate options below 7 (acidic) and above 7 (basic), since NaCl neither hydrolyses to give H⁺ nor OH⁻ in excess.