NEET Chemistry Chemical Equilibrium MCQ Question
Which of the following statements about the chemical equilibrium of water dissociation is correct?
The concentration of H+ and OH- ions in pure water at 298 K is equal.
The equilibrium constant Kw is independent of temperature.
The concentration of undissociated water is greater than that of dissociated water.
Kw can be calculated using the molarity of pure water only.
Correct Answer
Detailed Explanation
At 298 K, the concentration of H+ ions is 1.0 × 10 –7 M, which means the concentration of OH- ions is also 1.0 × 10 –7 M, confirming that the two are equal. Kw is temperature dependent, and while the concentration of undissociated water is much higher, it does not appear in the equilibrium expression.
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