The correct answer is (a) 14.
· A concentrated sodium hydroxide (NaOH) solution is a strong base, and its pH is typically 14, which is the highest on the pH scale, indicating a highly alkaline (basic) solution.
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· pH 10: Represents a weak base.
· pH 4: Represents an acidic solution.
· pH 7: Represents a neutral solution (like pure water).
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