Question

Give one example of following (a) evolution of gas... (B) change in colour (c) change of state

Answer 1

HEY mate !! HERE is your answer !!

Example of evolution of gas is as follows
:-)
HCl + Na --------»NaCl +H2(g)

Example of change in colour:-)
CuSO4.5H2O-----heat----»CuSO4 + 5H2O
( blue colour. ) ( white)..

Example of change in state:-)
2H2O(l)--------»2H2(g) +O2(g)

Hope it helps you.