| Observe the given figure carefully. |
|
| I. A white colored residue is left behind in the test tube. |
| II. Water droplets are observed on the upper cooler part of the test tube. |
| III. On adding water to the residue the colour changes to green. |
A) I and III only
B) II and III only
C) I and II only
D) All of these
Correct Answer: C
Solution :
On adding water to the white residue, colour changes to blue due to rehydration of anhydrous copper sulphate.
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