Assuming each solution to be 0.10 M , rank the following aqueous solutions in order of decreasing pH.
Rank the solutions from the highest to lowest pH. To rank items as equivalent, overlap them
a. N2H2
b. Ba(OH)2
c. HOCL
d. NAOH
e. HCL

Highest to lowest pH: Ba(OH)2, NaOH, N2H2, HOCL HCl

Explanation:

Stronger the acid, lower the pH, stronger the base, higher the pH.

N2H2 weak base, Ba(OH)2 strong base, HOCL weak acid, NaOH strong base, HCl strong acid.

Ba(OH)2 has produces more H ions, so it has a higher pH than NaOH.

the answer to your question is c.

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