Class X Sciences
[papers from previous years]

Crystals of copper sulphate are heated in a test tube
for some time

(a) What is the colour of copper sulphate crystals

(i) before heating, and
(ii) after heating?

b) What is the source of liquid droplets seen on the inner
upper side of the test tube during the heating?



(i) The colour of  crystals before heating is blue.
(ii) The colour of crystals after heating is white.

(b) during heating water droplets seen. water which present 
in the copper sulphate crystals cause this.