Question

A student was provided with four samples of solutions as shown in figures (I), (II), (III), and (IV). He determined pH value of each solution by using pH paper. The correct sequence of colour change of pH paper observed by the student will be :

$\begin{array}{cccc}& & & \\ \text{(a)}\text{indigo}& \text{light red}& \text{green}& \text{red}\\ \text{(b)}\text{red}& \text{indigo}& \text{green}& \text{light red}\\ \text{(c)}\text{indigo}& \text{red}& \text{green}& \text{yellow}\\ \text{(d)}\text{green}& \text{red}& \text{yellow}& \text{indigo}\end{array}$

Answer 1

$\begin{array}{cccc}& & & \\ \text{(a)}\text{indigo}& \text{light red}& \text{green}& \text{red}\end{array}$