From which substance are the dues manufactured ?
Why do eye-glasses become fogged, when the wearer comes form the cold outdoors into a warm room ?
Why does a diamond cut glass?
What is modern definition(iupac) of ph?
Why does the filament of an electric lamp glow, when current passes through it ?
What is Catalysis ?
Acid rain is caused due to pollution of atmosphere by
What is the bluish white precipitate formed after adding ammonia solution?
What are filters? Why are they used?
Why cooling is produced when a wet ?khus khus? screen is hung on the doors and windows ?
What is Molecular Formula ?
A dynamite catridge struck in a rock makes the rock burst in being fired. How dies it happen ?
what is acidity of a base?