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Select the correct choice for the colour imparted to oxidising flame by alkali metals

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Low ionisation energy

Easy excitation of the only electron of valence shell

Energy released in visible region when the excited electron returns to the ground state energy orbit

All of the above

answer is D.

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Detailed Solution

In Alkali metals the only electron of valence shell can be easily excited due to low ionisation enthalpy and in the process as visible light is emitted they show flame colour.

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