Question

Given below are two statements
Statement I: The changes in pH with temperature are so small that we often ignore it
Statement II: When the hydrogen ion concentration changes by a factor of 100, the pH changes by one unit
In the light of above statements, identify the correct answer from the options given below

• A. Both statements I and II are correct.
• B. Both statements I and II are not correct.
• C. Statement I is correct but statement II is not correct.
• D. Statement I is not correct but statement II is correct.

Hint:

Remember: pH is a logarithmic scale, so a 10-fold change in \([H^+]\) changes pH by 1 unit.

Answer 1

The Correct Option is C

Statement I is true because the temperature effect on pH is often negligible.
Statement II is false because a 100-fold change in \([H^+]\) leads to a pH change of 2 units, not 1.