What would be the pH of a solution which turns red litmus blue?

Correct option is D

The correct answer is: (d) 10

The pH scale ranges from 0 to 14 and is used to measure the acidity or alkalinity of a solution.

• Acidic solutions: pH < 7

• Neutral solutions: pH = 7

• Basic (alkaline) solutions: pH > 7

A solution that turns red litmus blue indicates that the solution is basic (alkaline), which means its pH is greater than 7. pH 10 is strongly basic.

Additional Information:

• pH1:

• pH 1 indicates a strongly acidic solution.

• Acids do not turn red litmus blue; instead, they turn blue litmus red.

• pH4:

• pH 4 is slightly acidic.

• Acids do not cause a red-to-blue litmus color change.

• pH5:

• pH 5 is weakly acidic.

• Again, no color change from red to blue occurs with acids