Which pair of the following chlorides does not impart color to the flame ?

Options

A. `BeCl_2` and `SrCl_(2)`
B. `BeCl_(2)` and `MgCl_(2)`
C. `CaCl_(2)` and `BaCl_(2)`
D. `BaCl_(2)` and `SrCl_(2)`

Answer

B

Explanation

Be and Mg atoms are smaller. The electrons in these atoms, are, more strongly bound and these are not excited by the energy of flame to higher energy states. The chlorides of these elements therefore, do not give any colour in flame.