Arrange the following solutions in the decreasing order of their :
Explanation of the correct answer.
Formulae used -
Step 1 - Calculation of pH of HCl -
contains
Step 2 - Calculation of pH of NaOH -
contains
Step 3 - Calculation of pH of -
is a salt of weak acid and strong base .
So, its will be greater than and will be less than .
(but not less than 2 as it is not a strong acid but a salt of a strong acid).
Step 4 - Calculation of pH of -
is a salt of strong base and strong acid .
So,
So, the order of the following solutions in the decreasing order of
Hence, option D is the correct answer.