One of the following solutions turns litmus papers to red: A)POH=3
B)[OH−] = 1×10−7 M
C)[OH-] = 1×10−5 M
D)POH=12

Answer : D. pOH = 12

solutions turns litmus papers to red : acidic (pH<7)

pH + pOH = 14

A. pOH = 3, pH = 11, alkaline

B. [OH⁻] = 1 x 10⁻⁷ ⇒ pOH = - log [OH⁻]= 7, pOH = pH = neutral

C. [OH⁻] = 1 x 10⁻⁵ ⇒ pOH = - log [OH⁻]= 5, pH = 9, alkaline

D. pOH = 12, pH = 2, acidic

d

Explanation:

ph is acid

acid litmus paper converts to red in acidic media