The colour of flame depends on:

(a) Nature of combustible substance

(b) Oxygen supply

(c) Temperature of the surroundings

Question

Question

This question was previously asked in

CTET (Mathematics & Science) Official Paper-II (Held On: 07 Jul, 2024)

Answer 1

CONCEPT:

Factors Affecting the Color of Flame

Nature of Combustible Substance: Different substances emit different colors when they combust due to the varying chemical properties and the presence of certain elements.
Oxygen Supply: The amount of oxygen available can affect the color of the flame. For example, a limited oxygen supply can produce a yellow, sooty flame, while a sufficient oxygen supply can produce a blue flame.
Temperature of the Surroundings: The ambient temperature can influence the flame's color to a lesser extent, but is not a primary determining factor.

EXPLANATION:

(a) Nature of combustible substance: True. Different materials produce different flame colors when they burn.
(b) Oxygen supply: True. The flame color varies with different oxygen concentrations.
(c) Temperature of the surroundings: False. While temperature can influence the combustion process, it is not a primary factor in the color of the flame.

So the correct answer is 1) (a) and (b)