Why is a halo formed round the moon, when the sky is clear ?
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It is due t refraction of moonlight on the outer edge of
earth?s atmosphere.
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Acid rain is caused due to pollution of atmosphere by
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.
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Organic Chemistry 
