Q. Consider the following statements regarding the pH scale:

1. It is a scale for measuring hydronium ion concentration in solutions.
2. Values less than 7 on the pH scale indicate an acidic solution.
3. As the pH value increases from 7 to 14, it indicates an increase in hydrogen ion concentration in the solution.

Select the correct answer from the codes given below:
Answer: Only 2
Notes: Statement 1 is incorrect because the pH scale measures hydrogen ion concentration, not specifically hydronium ion alone. Statement 2 is correct as pH less than 7 denotes acidic solutions. Statement 3 is incorrect because increase in pH from 7 to 14 indicates increasing basicity (OH- ions), not hydrogen ion concentration.