Which pair of the following chlorides do not impart colour to the flame ?

Options

A. a)`BeCl_(2)and SrCl_(2)`
B. b)`BeCl_(2)and MgCl_(2)`
C. c)`CaCl_(2)and BaCl_(2)`
D. d)`MgCl_(2)and CaCl_(2)`

Answer

B

Explanation

Among the alkaline earth metals , the size of beryllium and magnesium metals is very small . Therefore , the electrons in these metals are bounded more strongly and are not excited by the energy of flame to higher energy states , Hence , these metals or their salts do not impart any colour to the flame .