Question

Which of the following salt gives a crimson red colour in flame test?

• A. ${\mathrm{BaCl}}_2$
• B. ${\mathrm{CaCl}}_2$
• C. ${\mathrm{BeCl}}_2$
• D. ${\mathrm{SrCl}}_2$

Answer 1

The correct option is D

${\mathrm{SrCl}}_2$

Explanation of the correct option:

D. ${\mathrm{SrCl}}_2$

• ${\mathrm{SrCl}}_2$can give a crimson red color in a flame test.
• The electrons of ${\mathrm{SrCl}}_2$ excited by the thermal energy and then deexcitation of electrons occurs in the ground state.
• This results in the liberation of light in the visible range.

Explanation of incorrect options:

A: ${\mathrm{BaCl}}_2$ can give a light green color in a flame test.

B: ${\mathrm{CaCl}}_2$ give orange-red color in a flame test.

C: ${\mathrm{BeCl}}_2$ do not give any color to the flame test and it is happen because of the high ionization energy of $\mathrm{Be}$.

Hence, the correct option is D i.e. ${\mathrm{SrCl}}_2$.