Question

Four samples A, B, C and D change the colour of pH paper or solution to

Green, Reddish-pink, Blue and Orange. Their pH was recorded as 7, 2, 10.5 &

6 respectively. Which of the samples has the highest amount of Hydrogen ion

concentration? Arrange the four samples in the decreasing order of their pH​

Answer 1

Sl. No. Sample Colour change pH Nature

1 A Green 7 Neutral

2 B Orange 4 Weak acid

3 C Blue 9 Weakly Basic

4 D Pink 2 Strong acid