Question

Five students, Ankit, Nitin, Deepika, Gunjan and Pooja were given test tubes having solutions with pH 1.2, 13.5, 10.0, 7.4 and 2.2 respectively. The correct order of decreasing $O{H}^{-}$ ion concentration in these solutions is:

• A. Ankit > Pooja > Gunjan > Deepika > Nitin
• B. Nitin > Gunjan > Ankit > Pooja > Deepika
• C. Deepika > Gunjan > Pooja > Nitin > Ankit
• D. Nitin > Deepika > Gunjan > Pooja > Ankit

Answer 1

The correct option is D Nitin > Deepika > Gunjan > Pooja > Ankit

As the pH value increases from 7 to 14, it represents an increase in $O{H}^{-}$ ion concentration in the solution, that is, increase in the strength of alkali.

So order is: Nitin > Deepika > Gunjan > Pooja > Ankit