Which of the following have almost same pH?
Correct answer: B. Tears & blood
- A. Blood & egg (white)
- B. Tears & blood
- C. Tears & milk
- D. Milk & egg (white)
Explanation
The correct answer is Option B: Tears & blood. Both tears and blood have a pH close to 7.4, which is slightly alkaline. This makes them much more similar in pH compared to the other options. Blood and egg white (Option A) are somewhat close, but not as close as tears and blood. Tears and milk (Option C) have different pH values, with milk being more acidic. Similarly, milk and egg white (Option D) also differ significantly in pH, with egg white being more alkaline.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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