Which among the following statements with regard to pH scale is/are correct? I. It is a logarithmic: scale II. The scale is limited to 0-14 because the ionic product of water is about 10~14. III. The lower the value of pH, the greater is the acidity of th

examrobotsa's picture

Submitted by examrobotsa on

Q: 85 (NDA-II/2010)
Which among the following statements with regard to pH scale is/are correct?
I. It is a logarithmic: scale
II. The scale is limited to 0-14 because the ionic product of water is about 10~14.
III. The lower the value of pH, the greater is the acidity of the solution.
Select the correct answer using the code given below

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,6,7,2,6,3,2

keywords: 

{'ph scale': [0, 0, 1, 0], 'ph': [3, 0, 3, 3], 'scale': [1, 0, 2, 3], 'acidity': [0, 0, 1, 5], 'ionic product': [0, 0, 1, 0], 'value': [0, 0, 1, 0]}

Option 1 states that statement I and II are correct. Statement I states that the pH scale is logarithmic in nature, which is correct. The pH scale is a logarithmic scale that measures the acidity or alkalinity of a solution based on the concentration of hydrogen ions present. Option 1 is correct.

Option 2 states that statement I, II, and III are correct. Statement II states that the pH scale is limited to the range of 0 to 14 due to the ionic product of water being about 10^-14. This is also correct. The pH scale is divided into 14 units, with 0 being the most acidic, 7 being neutral, and 14 being the most alkaline. The range is determined by the concentration of hydrogen ions and hydroxide ions in a solution. Option 2 is correct.

Option 3 states that statement I and III are correct. Statement III states that the lower the value of pH, the greater is the acidity of the solution. This is also correct. The pH scale is inversely related to acidity, meaning that as the pH value decreases, the acidity of the solution increases. Option 3 is correct.

Option 4 states that statement II only is correct. This is incorrect as both