JEE Main · 2022 · 26 Jun 2022 · Shift 2 · s-Block Elements

s-block element which cannot be qualitatively confirmed by the flame test is

(A)Li
(B)Na
(C)Rb
(D)Be✓ Correct

Answer: (D)

Solution

Most s-block elements give characteristic flame colors:

Li: Crimson Red
Na: Yellow
Rb: Red violet
Be: No color

Beryllium (Be) does not impart any color to the flame due to its small size and high ionization energy. The energy from the flame is insufficient to excite the electrons to higher energy levels, so no characteristic emission occurs.

Therefore, Be cannot be qualitatively confirmed by the flame test.

JEE Main · 2022 · 26 Jun 2022 · Shift 2 · Single correct option

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