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CBSE / Chemistry Questions

Total Questions 1082
If every oxigen in a water is respire by fishes will that water will became (hydroen because water is made up of h2o hydrogen and oxygen)?
what is chemical reaction
Define rancidity
WHAT DO ALL ACIDS AND ALL BASES HAVE IN COMMON
WHAT IS catenation OF CARBON?
HOW TO GIVE COMMON NAMES FOR THE ORGANIC COMPOUNDS??
convert- a)ethyne to bromo ethane b)1-bromopropane to 2-bromopropane
explain the following a)pbcl4 is less stable than SnCl4 b)boric acid is monobasic non protic acid c)SnCL4 is good reducing agent d)BCl3 is better lewis acid than BF3 e)co2 is gas while silica is solid
how is hydrogen peroxide used to restore the original colour of old lead paintings?give an chemical equation to show that it acts as both oxidising and reducing agents????
how to balance an equation with oxidation no. method and half reaction method?? step by step explain please???
what is common ion effect?
What is Helium?
WHETHER THERE IS ANY EASY WAY TO STUDY IUPAC NOMENCLATURE OF ORGANIC COMPOUNDS??
what is meant by diffusion?
formula of salt
What is solution of salt
What is matter
how to find log and anti-log ?full procedure???
1)How is the rate of escape of gasses related to their molar masses or molecular masses?
what is an inorganic benzene? 2) Lanthanoid contraction is due to increase in which factor of atom? 3)What is the use of ferrosilicon in steel industry? 4)What is the product when benzaldehyde condenses with N,N-dimethylaniline in presence of anhy. ZnCl2 ?