The only correct statement among the following is — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

Alkalosis (high pH) is caused by a relative deficiency of $\text{CO}_2$ (carbonic acid) in the blood, often due to hyperventilation. Re-inhaling exhaled $\text{CO}_2$ from a bag forces more $\text{CO}_2$ back into the lungs and blood, increasing the $\text{H}_2\text{CO}_3$ concentration, shifting the buffer equilibrium to lower the pH back to normal. Therefore, correct answer is B.