Question

Which of the following radicals, gives the apple green flame during flame test?

• A. $B{a}^{2+}$
• B. $S{r}^{2+}$
• C. $C{a}^{2+}$
• D. $N{a}^{+}$

Answer 1

Answer: (A)

Flame colouration All the alkali and some alkaline metals impart a characteristic colour to the flame. When paste of salt in conc. $HCl$ is burnt on a spetchula the following coloured flame appears for different radicals.

Cation	Colour
$N{a}^{+}$	golden yellow
$K^{+}$	violet
$C{a}^{2+}$	brick red
$S{r}^{2+}$	crimson red
$B{a}^{2+}$	apple green

Therefore $B{a}^{2+}$ radical gives the apple green flame during flame test.