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Alkali metals impart colour to bunsen flame due to

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low ionization energies

low melting points

thier softness

the presence of one electron in the outer most shell

answer is A.

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Detailed Solution

Alkali metals show characteristic colours on the fire due to low ionisation enthalpy, when these alkali metal or salt of it is heated in a flame, the valence electrons are excited and go in the higher energy level.

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