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CBSE / Chemistry Questions

Total Questions 1082
What is dissociating?
what is diffusion
a)please explain a reason why fresh air cannot be regarded as pure substance? b)Electrolysis of water is a chemical change?
smoke and fog are aerosols.In what way are they different?
sodium chloride contains two elements, but it is still a pure substance.please assign reasons.
What is mass?
How can we easily write the equations?
WRITE THE SET OF ALL QUANTUM NUMBERS OF LAST ELECTRON OF POTASSIUM
name of 119th element in pereiodic table
classification of matter?brief explation of the chapter? and about imrortant terms?
give reasons: *The particles of a solid have the storngest intermolecular forces.
why are nylon clothes not preffered during summer?
give reasons for the following: a) the particles of a soild have the strongest intermolecular forces. b) hot potter kept in a plate cools down faster than when kept in a glass.
WHAT SRE SHAPES OF ATOMIC ORBITALS?
about plaster of paris
what is the difference between thermoplastics and thermosettingplastic ?
1)HOW DO WE COME TO KNOW THAT A CHEMICAL REACTION HAS TAKEN PLACE? 2)IS THERE ANY OTHER SHORTER WAY FOR REPRESENTING CHEMICAL EQUATION? 3)IS THE NUMBER OF ATOMS OF EACH ELEMENT THE SAME ON BOTH THE SIDES? 4)IS THE CHEMICAL EQUATION MG+O2->MGO Balanced? 5)3FE+4H2O->FE3O4+4H2 DOES THIS EQUATION TELL US ANYTHING ABOUT THE PHYSICAL STATE OF EACH REACTANT AND PRODUCT? 6)WHY SHOULD A MAGNESIUM RIBBON BE CLEANED BEFORE BURNING IN AIR? 7) RESPIRATION IS AN EXOTHERMIC PROCESS.EXPLAIN?
what are the physical properties of metals and non-metals?
is alcohol acidic or basic?
different types of chemical reactions and the definition