| 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: |
 |
 |
| (a) indigo light red green red |
| (b) red indigo green light red |
| (c) indigo red green yellow |
| (d) green red yellow indigo |
Answer:
(a) indigo light red green red
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