Question

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 D respectively. the correct sequence of increasing order of the pH value for samples is -

• A. A < B < C < D
• B. A < D < C < B
• C. C < B < A < D
• D. B < C < A < D

Answer 1

The correct option is D B < C < A < D

Dark red has least pH, followed by light orange, light green and dark blue has highest pH because it is basic.