Question

(v) Which one of the steps while burning a candle is not reversible?
(a) Melting of solid wax
(b) liquid wax changes into vapours
(c) Wax vapour bums into flame
(d) All of these

Answer 1

Answer:

Hey!

Explanation:

The correct option is B

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Answer 2

Answer: The step which is is not reversible while burning  a candle is option c. wax vapour burns into flame

Explanation:

Reversible change refers to the change in which the end products of the change can be reverted to the initial substances.

In an Irreversible change, the initial reactors or substances cannot be brought back.

The melting of solid wax is a reversible step in the burning of a candle since the melted wax can be cooled down to form the solid wax again.

Liquid wax changing to vapours is also a reversible change since once the liquid wax changes to the vapour form, it is gaseous.

Wax Vapours burning into flame is not reversible because once burnt, the wax vapours cannot be obtained again.