Match the elements given in Column I with the colour they impart to the flame given in Column II.
`{:(Column I, Column II),(A.Cs,1."Apple green"),(B.Na,2."Violet"),(C.K,3."Brick red"),(D.Ca,4."Yellow"),(E.Sr,5."Crimson red"),(F.Ba,6."Blue"):}`

Answer

A. `rarr(6)` B. `rarr(4)` C. `rarr(3)` E. `rarr(5)`. F. `rarr(1)`

Explanation

Elements with the characteristic flame colour are as follows
A. Cs-Blue B. Na-Yellow C. K-Violet
D. Ca-Brick red E. Sr-Crimson red F. Ba-Apple green
Flame colours are produced from the movement of the electron in the metal ions present in the compounds. These movement of electrons (electronic excitation-de-excitation) requires energy. Each atom has particular energy gap between ground and excited energy level therefore each of these movement involves a specific amount of energy emitted as light energy, and each corresponds to a particular colour. As we know energy gap between ground and excited state energy level increases wavelength of decreases and complemently coloure is observed as a result.