Equilibrium
2 solved NEET Chemistry previous year questions on Equilibrium, each with the correct answer and a full explanation.
Q1
pH of water is 7 at 25 degree celsius. If water is heated to 80 degree celsius, it's pH will:
✓ Correct answer: c) Decrease
ExplanationAs water is heated to 80°C, the auto-ionization of water ( ) increases, leading to a higher H⁺ concentration.Since pH = -log[H⁺], an increase in H⁺ results in a lower pH, though water remains neutral as [H⁺] = [OH⁻].
Q2
pH of water is 7 at 25 degree celsius. If water is heated to 80 degree celsius, it's pH will be : [JEE Main 2025, 23 Jan (Shift 2)]
✓ Correct answer: c) Decrease
ExplanationAs water is heated to 80°C, the auto-ionization of water ( ) increases, leading to a higher H⁺ concentration.Since pH = -log[H⁺], an increase in H⁺ results in a lower pH, though water remains neutral as [H⁺] = [OH⁻].
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