Question

24. A student was given four unknown colourless samples
labelled A, B, C and D and asked to test their pH using
pH paper. He observed that the colour of pH paper turned
to light green, dark red, light orange and dark blue with
samples A, B, C, and Drespectively. The correct sequence
of increasing order of the pH value of samples is
(a) A<B<<<D (b) A<D< (<B
(c) C<B<A<D (d) B <C<A<D
​

Answer 1

D is the right answer......