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
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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