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The flame of caesium is in the colour _____________

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in Chemistry – Class 11 by (148k points)
The flame of caesium is in the colour _____________

(a) white

(b) red violet

(c) yellow

(d) blue

The question was posed to me during an online interview.

This question is from s-Block Elements topic in chapter s-Block Elements of Chemistry – Class 11

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Correct option is (d) blue

The explanation: Alkali metals and their salt impart characteristic colours to the flame because the outer electrons get excited to higher energy levels. When the electrons return to the original state, it releases visible light of a characteristic wavelength which provides colour to the flame. The colour of the Flame of the caesium is blue.

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