What is the metal used to extract copper from the solution of copper sulphate?
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Differentiate between modern periodic table and mendeleevs table?
when we covert any substance into vapour state from solid state, is it ionized or not?
What is fluidity of a liquid?
When the heat rays from the sun area focused on a piece of black cloth by means of a lens, the cloth catches fire. Why ?
Explain the Mixture?
Fresh form of water is obtained from?
What is si unit of viscosity-coefficient?
A balloon constructed in Calcutta during July-August was found to show cracks at most wooden joints when received at Ferozepore in December. What is the probable cause ?
Why are substances like caustic soda and calcium chloride called hygroscopic substances ?
What is Atomic weight?
Why is it dangerous to have a coal fire burning with doors and windows closed ?
What is the chief commercial use of Phosphorus ?