What is given off on burning a candle ?

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.

2 Answers UST,

Explain the Modern Atomic Theory ?

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Why we use potassium dichromate in control of absorbance in uv region and copper sulphate in control of absorbance in visible region?

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what is ppm?how to prepare 75 ppm?

6 Answers Bureau Veritas,

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Explain extraction of ephedrine from a mineral block?

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How is brass solution prepared?

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