Question

The metal that produces red-violet colour in the non-luminous flame is:

• A. $Ba$
• B. $Ag$
• C. $Rb$
• D. $Pb$

Answer 1

Answer: (C)

$Rb$

Alkali metals and their salts impart characteristic colour to flame. the reason for flame colouration is that the energy of the flame causes an excitation of the outermost electrons which when return to their original position give out the energy absorbed in the visible region.Thus,Rb gives red-violet colour to the flame.