Which of the following changes are irreversible in nature?

Dissolution of salt in water

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Burning of a candle

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Dissolution of sugar in water

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Melting of candle wax

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Solution

The correct option is B
Burning of a candle

We can obtain the sugar and salt dissolved in a solution by the process of evaporation. Melted wax can be converted to its solid state upon cooling. The burning of a candle is an irreversible process.

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Similar questions

Which of the following does not involve a chemical reaction ?

(a) digestion of food in our body

(b) process of respiration

(d) melting of candle wax on heating

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