Question

Flames of different substances __________ colours.

• A. 1, 2, 3 and 4
• B. 1, 3, and 5
• C. 2, 3, 4 and 5
• D. 1, 3, 4 and 5

Answer 1

The correct option is C

2, 3, 4 and 5

Flame colour may be different for different substances because on burning they emit waves of different wavelength due to differences in their atomic structures. This is actually a characterstic property of materials. For example, Sodium on burning emits a yellow flame while Potassium emits a lilac flame. This property is utilized in flame tests to determine the elemental composition of materials.