Answers
Auto ionization is taken in to consideration for very dilute solutions. From the given options
a) 0.1 M HCl
b) 0.00080 g NaOH in 0.5 L soltion, concentration = 4 x 10-6 M
c) 3 x 10-8 M HNO3
d) 0.0245 M KNO3
Option b, c are very dilute solutions and we need to consider auto ionization while calculating the pH.
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