Dear student …
Generally pH scale is used to determine whether solution is acidic , basic or neutral.
When...
pH Value ranges form ---> 0 to 6 ---> Solution is Acidic -----> It changes Blue litmus paper to Red.
pH Value ranges form ---> 8 to 14 ---> Solution is Basic -----> It changes Red litmus paper to Blue.
pH Value is ---> 7 ---> Solution is Neutral -----> It doesn’t effect litmus paper at all.
According to given data Litmus is changing Red to Blue...Hence it contains Basic solution...
Range of this solution is 8 to 14....
In the given options 10 is that answer which is in range of 8 to 14.
Hence correct option (D) : 10
