Most of the alkali metals glow with a characteristic color when placed in a flam

Question

Most of the alkali metals glow with a characteristic color when placed in a flame. As a result, a flame test can be used as a qualitative way to identify an unknown metal. Suppose you were asked to identity three unknown samples. Each sample is expected be one of the following three metals: lithium, sodium and potassium. Based on what you know about size, electron transitions within an atom and light emission, which of the following seems the most unlikely. a. Compound A is lithium b. Compound A is potassium c. Compound B is sodium d. Compound C is potassium

Explanation / Answer

In flame test for determination of metal ions potassium gives lilac or violet coloured flme, sodium gives yellowish orange elame whereas lithium gives red flame.

Hence according to data provided Compound A givong red flame is lithium, compound B is sodium whereas compound C is potassium.

option a, c and d are correct.

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