Subject :NSO Class : Class 10
Observe the given figure carefully.
Which of the following observations are correct?
I. A white coloured 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