Question

One of the elements present in carnalite shows flame colouration. The colour of the flame is:

• A. orange
• B. green
• C. yellow
• D. lilac

Answer 1

Answer: (D)

The formula of carnalite is $\text{KCl}\text{.MgC}{\text{l}}_{\text{2}}\text{6}{\text{H}}_{\text{2}}\text{O}\text{.}$ In this formula only potassium gives colour (lilac) to flame, whereas magnesium does not give flame colouration.