Select the correct choice for the colour imparted to oxidising flame by alkali metals
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a
Low ionisation energy
b
Easy excitation of the only electron of valence shell
c
Energy released in visible region when the excited electron returns to the ground state energy orbit
d
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.