Question

Which alkali metal during flame test will show colour
corresponding to maximum wavelength?
(a) Na
(b) Cs
(c)Li
(d)K
The answer is Li . but from this table given in ncert It is K or Rb . Help

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Answer 1

Answer:

LITHIUM. It is due to high Ionisation enthalpy of Li, it absorbs blue colour and emits red colour (larger wavelength).