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Q.

Which coloured flame is observed when ethanol burns in air?

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a

Blue flame

b

Sooty flame

c

Red flame

d

Yellow flame

answer is A.

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Detailed Solution

Concept- Ethanol is a volatile, flammable, colourless liquid with a mild characteristic odour. It is also called pure alcohol.
The chemical formula of ethanol is

C_{2} H_{5} OH

and it belongs to the alcohol family.
Ethanol reacts with oxygen and gives carbon dioxide and water, this is called combustion reaction. Ethanol usually burns with a flame that is mostly blue. Complete combustion produces a typical blue flame caused by excited carbon dioxide.
The chemical equation showing the burning of ethanol in air is-

C_{2} H_{5} OH + 3 O_{2} ⟶ 2 C O_{2} + 3 H_{2} O + thermal energy

Therefore, a blue flame is observed when ethanol burns in air.
Hence, the correct answer is 1.

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