Which one of the following is the <strong>CORRECT</strong> order of pH for the given substances?

  1. A. Coffee \lt Lemon juice \lt Milk of magnesia \lt Blood
  2. B. Milk of magnesia \lt Blood \lt Coffee \lt Lemon juice
  3. C. Lemon juice \lt Blood \lt Coffee \lt Milk of magnesia
  4. D. Lemon juice \lt Coffee \lt Blood \lt Milk of magnesia ✓

Correct Answer: D. Lemon juice \lt Coffee \lt Blood \lt Milk of magnesia

Explanation

The pH values are approximately: Lemon juice (~2), Coffee (~5), Blood (~7.4), and Milk of magnesia (~10.5). Thus, the correct increasing order of pH is Lemon juice, Coffee, Blood, and Milk of magnesia.

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