Question

Potassium ions impart _________ color to the flame.
A. red
B. lilac
C. green
D. violet

Answer 1

To solve this question first we need to understand what happens in a flame test. We can define a flame test as an analytical procedure which is used in chemistry laboratories to detect the presence of certain elements and metal ions based on each element's characteristics.

Complete step by step answer:
As we know that a flame test is a type of qualitative test which is used in laboratories to determine the identity or possible number of identities of a metal or a metalloid ion found in an ionic compound.
To perform a flame test we know that different metal ions produce different flame colors when they are heated strongly. So, to perform a flame test we need to follow these steps:
First, dip a clean wire loop into a sample of solid for compound testing.
Then, put the loop into the edge of the blue flame from a Bunsen burner.
After that, observe and record the flame color produced.
According to the question, when we perform a flame test of potassium ion then a lilac color is obtained. This lilac color indicates the presence of potassium ion (option B).

So, the correct answer is Option B .

Note:
Applications of flame test:
Some metals can only be identified by flame tests.
Heat of the flame gives electrons energy.
Electrons give out energy in the form of light.
A sample of the salts is placed in the Bunsen burner.