Which of the following processes does not involve the absorption or evolution of heat?

Rolling of dough

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Combustion of fuel

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Respiration

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Lighting a candle

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Solution

The correct option is A Rolling of dough
All of the given options expels heat upon reacting except rolling of dough. Combustion of fuel also does the same thing. The energy is used to drive machinery. In respiration, oxygen is used and carbon dioxide is released. Lightning a candle evolves heat.

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