Correct Answer: Saliva — pH 9.0 to 10.5
Subject: chemistry
Explanation: • <b>Key Fact</b> The pH of human saliva is slightly acidic to neutral, falling between 6.2 and 7.6, not 9.0 to 10.5. • <b>Supporting Detail</b> Gastric juice is highly acidic (1.0), Vinegar is acidic (2.4), and Bleaching powder is highly alkaline (11.0). • <b>Related Concept</b> Blood plasma has a tightly regulated alkaline pH of 7.35 - 7.45. • <b>Why wrong options are wrong</b> Options A, B, and D provide the exact correct pH values as listed in the scientific data provided. • <b>Exam Trick</b> Saliva is close to neutral (~6.2-7.6) because extreme pH in the mouth would damage teeth and tissues. • <b>Additional Info</b> Other acidic beverages include Wine (2.8), Apple juice (2.9 - 3.3), and Orange juice (3.7).
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