In my opinion, most of the students would have done great in maths in childhood (say 1st to 4th STD), not because they were studying well, it might be because the concepts were easy.
But what happens...
1.Some crystals of copper sulphate were dissolved in water, formed which colour?
Ans:blue colour
2.When dilute HCL added to zinc pieces, then what will happen?
Ans: Small bubbles of H2 glass appear...