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Which is the main constituent in air ?
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Distinguish between flannel and flannelette ?
While standing on railway platform and heating the whistle of an engine coming towards us , we hear the sound increasing; bit when the engine is receding from us it appears to fall why ?
What is the limitation of cod?
Explain the Isobars?
Why ph scale range is 14? Why it is not less or not greater than 14? Solution of hcl or hydrogen containing liquid has a ph. But if the solution is kmno4 here nothydrogen power does it ph?
Is air mixture or compound ?
What is positive testing in relation to chemistry? For example, the sentence reads "Sample solutions are solutions known to contain one of each of the following ions, silver ion, Ag+(aq), barium ion, Ba2+(aq), and iron (III) ion, Fe3+(aq). Testing solutions are the solutions containing a polyatomic ion that can react with one of the metal ions to give a positive test." I am then asked to define what a "positive test" is. I am currently a student who is pretty new to chemistry, please try and make your answer as simply as possible. Thanks for the help.
Why does a freely suspended magnetic needle always point North and South ?
What is the composition of ferroin?
How many elements have been discovered on the Periodic Table?
why the pH scale range is 0-14?
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How can fresh water be made from salt water ?
Organic Chemistry 
