Question

Test tube holder
Dry test tube
Blue copper
sulphate crystals
Burner
Which of the following observations are
correct?
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 Ill only
b . 2 or 3 only
c . 1 and 2 only
d. all of these​

Answer 1

Explanation:

write one by one answer please

Answer 2

Answer:

d all the above is the correct answer